Apple is really, really close to hitting 1 billion app downloads across the world, according to its new countdown page. If you download an app, you’ll be enrolled in a contest to win a $10,000 iTunes Gift Card, an iPod touch, a Time Capsule, and a MacBook Pro. TechCrunch is holding its own contest in honor of this occasion. Whoever guesses when it will hit one billion, and is closest in minutes and seconds will get free TechCrunch T-shirt. Leave the guesses in comments; we’ll contact the winner.

Apple also featured the all-time top 20 apps, both paid and free.

Top 20 All-Time Free Apps:

1. Facebook

2. Google Earth

3. Pandora Radio

4. Tap Tap Revenge

5. Shazam

6. Pacman Lite

7. Backgrounds

8. Touch Hockey

9. Labyrinth

10. Flashlight

11. Urbanspoon

12. Movies

13. iBowl

14. Lightsaber Unleashed

15. SOl Free Solitaire

16. MySpace Mobile

17. Virtual Zippo Lighter

18. The Weather Channel

19. BubbleWrap

20. Remote

Top 20 All-Time Paid Apps:

1. Crash Banidcoot

2. Koi Pond

3. Enigmo

4. Bejeweled 2

5. iBeer

6. Moto Chaser

7. Pocket Guitar

8. Flick Fishing

9. Tetris

10. Texas Hold Em

11. Super Monkey Ball

12. Pocket God

13. Cro-Mag Rally

14. Ocarina

15. Fieldrunners

16. iFart Mobile

17. Touchgrind

18. iHunt

19. iShoot

20. Monopoly

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(Via TechCrunch.)