Well, it's my first experience with Linux, so while it is possible, I'm not yet doing a lot of the real geeky command-line stuff, but the GUI is nice, works real fast and with the exception of a few beta testing apps I've had no problems whatsoever and I have not experienced any drag when running many different apps simultaneously -yet, of course
As I use Firefox at home so I also find the Firefox browser on Maemo great (with on-line sync of bookmarks, history, passwords and whatnot) -though it
is a bit slower than the (Mozilla based) MicroB(rowser) it came with.
I have most of my media in FLAC and/or mkv, so the plug-in that allows the media player to play (most of) these is also one of the reasons for my choosing this device (plus the simple cable that enables me to use it as a media player that hooks up to a TV (or stereo system; but the FM transmitter usually does the trick when it comes to playing music over an external system) is something I've been using quite a bit)
I have a few widgets that I love very much:
Search that enables you to add search engines from across the net (Danish Wikipedia, Danish dictionary, Memory Alpha, Urban Dictionary... (I think putting TrekBBS-Search into the search widget is the most geeky thing I have done yet, actually)) is very handy. I never Twat or FB, so I couldn't say anything about that, but I like the way IM and SMS (texting) is possible either through the preloaded conversation client or through, say, an aMSN client for Fremantle (Maemo 5).
Of course there are apps for monitoring/controlling the system, of which I am using some to get acquainted with the inner workings...
A more experienced user (like
RevdKathy 
) might have more to say about the stuff I didn't get into in this post though, and if you have any more specific question: don't hesitate to ask here
