I, like everyone else these days, know a lot of people with iPhones or an Android/Win Mobile 7 equivalent or iPads. Most of which are ladened with applications of every conceivable nature. I have been somewhat teased by one or two of these friends for having a sparse community of apps resident on my phone, but I like it this way.
Everything I keep installed on the device has a purpose and is used on a regular or semi regular basis. They're all apps that, should they be uninstalled, within the week I'd be hastily downloading them again in order to make use of one feature or another.
I realise it's entirely by personal preference, and it's amusing to observe the different personalities among my friends. Some of them delight in demonstrating their most recent apps to everyone, even when those apps are of limited comedic value.
For the longest time I had only one Home Screen on my iPhone. I still have only one on my iPad. There simply aren't that many apps that I feel I make reasonably frequent use of, or that assist me in any of the tasks I rely on my phone to perform.
Probably the most striking omission from my crop of apps are games. I'm a gamer, I have certainly accrued years worth of time spent playing computer games, probably more time than most people would consider healthy, especially as a teenager. I do own some games for the iPhone and iPad but I quickly removed them. Some of them are excellent and worth playing, but I don't really like either device as a gaming platform.
I think it's an interface and complexity issue. I gravitate towards games with a lot of depth, and while some of the puzzles on an iPhone game are very challenging I'm sure, it's not the same level of involvement.
Many of the apps, as you can see from the screen captures, are communicative. Path, Twitter and AIM are each ways to keep in touch with people, particularly people that aren't easily called or contacted by text message or people that aren't close enough friends to be trusted with my phone number.
Without giving it much thought at all I practice my minimalist tendencies. Apps often get a 'trial run' of sorts as i tend to constantly weed out the ones I feel bring the least value or that I haven't opened in a while. I think it's something that most of my iDevice owning friends would benefit from, if only to clear out their morass of home pages and folders every once in a while. Consider that a device that you use for communication second only to your own physical body is a reflection (and almost part) of yourself, it should always be ready to assist you, and clutter will get in the way of that purpose.