My 73 apps on my iPhone. Here's what my home screen (and only screen at the moment) looks like. In each group, here's the apps I use. I also use other apps, (I've had more than 300 on my phone at one time) but have deleted ones that I haven't used in the past week. I wanted to get down to the core apps I actually use nearly every day.
5. Salesforce Chatter.
Social, group 2.
10. Tweetlogix (better twitter app, I might actually delete the Twitter app).
13. Pixable (photos).
(I usually have more in this group, like News.me, but Flipboard is the one I can't live without).
17. Google Voice.
18. DisqusPro (comment management for my blog).
19. Ignition (lets me remote control my home mac).
20. Podio (work with coworkers).
25. Lanyrd (conference event guide).
28. Waze (great traffic app)
29. AroundMe (find things near you, very useful for lightweight lookups).
30. Uber (get a ride around SF and other cities).
31. Sidecar (a new Uber competitor I'm testing out.
32. Latitude. I don't know why I use this but I still do. Blame my love of all things Google.
33. RunKeeper. I don't use this as much as I should.
34. Glympse (for showing people when I'll arrive and how late I am).
35. HomeSnap (take photos of houses and learn info about them).
37. Amazon PriceCheck.
39. Karma. Cool app, video coming soon on this one, helps you get gifts for people you love.
40. Apple Store.
41. Zaarly. Hire people to do stuff for you.
45. Teleportd. Photo search in real time.
46. 360 Panoramic photo.
47. Showyou. Video discovery and search app.
48. Hulu Plus. TV shows.
49. Glmps. Share video snippets of my life.
50. Deja. VIdeo discovery.
I usually also have SocialCam here, but I don't use it enough.
52. Testflight (for trying out pre-release apps).
59. Kindle for books.
60. IntoNow. Share TV socially.
61. Fandango. Movie tickets.
62. Ticketmaster. See upcoming shows/events.
66. Expensify for expenses.
67. Bump Pay.
69. Remote for running my Apple TVs.
70. Find iPhone.
71. iTunes U.
72. Jawbone Up.
73. Drone Control for my quadcopter.