Note: The links below will take you to the developers' Web sites. However, the easiest way to learn more or download a particular app it is to tap the App Store icon on your iPhone. You can also browse through the apps on your desktop or laptop through iTunes.
Business
1. Jobs
Search the CareerBuilder.com database of more than 2 million job openings right from your iPhone. If you like, you can search for jobs only in the city where you are standing or bring up an integrated Google map of the city where the posting is located. One downside: you can't actually apply for the jobs from your phone. Developer: CareerBuilder.com. Price: Free.
With this app, you can access real-time business performance information from your Oracle Business Intelligence Applications. View pre-defined reports and charts, receive alerts, and more. Developer: Oracle. Price: Free.
Use your PC or Mac from your iPhone. Mocha VNC Lite connects you to a VNC server so that you see the screen, access the files, and do everything else just like you do on your regular computeronly on an itty, bitty screen. Developer: MochaSoft. Price: Free.
4. Expense2Go
If your company uses Salesforce CRM, Expense2Go simplifies the process of filling out and submitting your expense reports. You can even use your iPhone's built-in camera to take a picture of your receipts and submit them along with your reports. Developer: Model Metrics LLC. Price: Free.
Education
5. Starmap
Is that the north star or is that the north star? Put your coordinates into this handy app for on-the-spot help identifying stars, constellations, galaxies, and other celestial bodies. Developer: Fredd. Price: $11.99.
6. Netter's Anatomy Flash Cards
Here are more than 300 images that can help any med school student memorize the names of muscles, bones, joints, vessels, and viscera. And if you're a layperson, it might help you figure out what your doctor is talking about. Developer: Modality Inc. Price: $39.99.
Having trouble visualizing quantum mechanics? Atom in a Box shows the probability distributions for electrons in a hydrogen atom. Developer: Dauger Research Inc. Price: $9.99.
AccelaStudy is basically a flashcard program that tests your knowledge of Spanish/English vocabulary. You can also use it like a bilingual dictionary when you encounter unfamiliar words. As you might expect, several other languages are available in addition to Spanish. Developer: Renkara Media Group Inc. Price: $14.99.
Entertainment
9. Remote
Turn your iPhone into a remote. This app lets you control audio and video playback on your Mac or Apple TV. Developer: Apple. Price: Free.
10. BoxOffice
Currently the highest-rated of several movie listing apps, BoxOffice shows which movies are playing where and when in your area. You can also read reviews, check Rotten Tomotoes ratings, and even purchase tickets. Developer: Cyrus Najmabadi. Price: Free.
11. PhoneSaber
PhoneSaber displays a Star Wars-style light saber on your iPhone screen and plays appropriate sound effects as you swing it through the air. Completely useless, but oddly fun in a geeky sort of way. Developer: TheMacBox. Price: Free.
12. Shakespeare
Several different apps allow you to use your iPhone as an eBook reader. This one comes with the complete works of Shakespearejust in case you need something a little more intellectual to balance out your use of PhoneSaber. Developer: Readdle. Price: Free.
13. Scribble
This barebones drawing program lets you create simple line drawings in red, yellow, green, or blue. Don't like what you drew? Shake the iPhone to erase your picture and start over. Developer: Zintin. Price: Free.
Finance
14. Bloomberg
Get all the news, stock quotes, and other financial information you need to keep up with world markets. You can even create a custom list of stocks to follow. Developer: Bloomberg LP. Price: Free.
15. Tips
Easy-to-use slider controls make it easy to figure out the appropriate tip for your meal based on the amount of your bill, quality of your service, and number of people in your party. Similar apps are available for free, but this one's simplicity makes it worth the $1.99. Developer: Kudit.com. Price: $1.99.
16. Puluwai Real Estate Search
Find homes for sale near your current location or in the town of your choice. This app lets you search for various criteria, view photos, and get driving directions. Developer: rawthought. Price: Free.
17. Spend
This no-frills budgeting app makes it easy to keep track of your finances and stick to your budget. On the down side, you can't upload or download data to a full-blown money management program, but it's perfect for those who want to keep track of their purchases without spending a lot of time on the computer. Developer: Adamcode. Price: $.99.
Games
18. Enigmo
Move the sponges, bumpers, and other obstacles to direct the flowing liquid to its destination. Deceptively simple and fascinating to watch, Enigmo includes 50 different levels with falling water, lava, and oil. Developer: Pangea Software, Inc. Price: $9.99.
19. Tap Tap Revenge
Think you've got rhythm? Find out with this modified version of Dance Dance Revolution. Developer: Tapulous. Price: Free.
20. Texas Hold'em
Awesome graphics set this version of the popular poker game apart from others. You can play against the computer or play against friends on a Wi-Fi network. Developer: Apple. Price: $4.99.
21. 
Crash Bandicoort
This racing game is based on the Crash character from the Playstation games. Tip your iPhone to control your kart around 12 different racing tracks as you attack other characters with 8 different weapons. Developer: Vivendi Games Mobile. Price: $9.99.