At the moment...(year after year it changes subtly )
for the n8x0's and n900's
(and past the obvious "givens" like term, vim etc etc..)
for my n8x0's currently (especially my n800s with extra card storage slots in the leather n800 case)
a ton of varied music on one card, with my library of esoteric ebooks, my portfolio of work and some work in progress, and some devel work , so I can listen to music while reading or working...
a ton of video on another card...my favourite films of all time,
and in the external slot filled with the entire collected works of shakespeare performed, and all the classic operas.
So I just change out the card I need from the slot ...
and the internal slot is a modest 32gb with turbo on it all the bells and whistles and a few other partitions with other interesting alt os's to play with.
SO THAT is my "Shipwrecked on a desert island nokia"
No matter what it always goes with me, with 5 extra batteries and a solio solar charger and batt storage....just in case...not that I am paranoid...
Just a good nxx0 boy scout...

So my given progs for the n800 (and similarly the n810) are lean and functional
- fbreader
-streamtuner
-xmms
-oscp
-milkytracker
-all the best image / photo viewing and rendering progs
-kmplayer is my staple as well as a couple other vid progs

Those are currently the progs I use most at the moment...and for the last year or so with the n8x0

For the n900...
I have recently (this last year) ceased using my n900's as a devoted "daily driver"

And now only use it daily for the following
-stellariium so i can sit out on a hill at night near the house or at work and enjoy using it.
- back and forth every day to work I play the entire playlist from CEU Past Perfect Medieval Radio ...one of the best stations I have ever found.....that I streamtuned and copied. (which is about 12 gb so far..)....for those who like truly ancient music predating the dark ages ...
great site...
-oscp for said tunes
-sunvox
and naturally
-gtkgep ..
I have one of my smaller harps at work sitting in the corner...
So when I get to work...
I play my part mainly as "the Watcher who Watches the Watchers"
I watch everything, everyone, everywhere on over 100 camera (soon to become over 160 with the new additions) views and make sure everyone on sites are safe. That is my primary job as well as thwarting evil doers, preventing crimes from occurring, preventing fires, preventing all kinds of nastiness and assist in Heli- MEDEVAC's once or twice a week..
So it is a pretty cool gig...as exciting as it sounds..yet I am left to my best judgement concerning crises and have not yet failed my superiors in that.
So I am left to my own devices all night...and only see a few humans on my way to work, the person I am relieving, and my relief come the morning and some few people in the morning onn the way back home...
I see every sunset, every sunrise and all the stars in between ...
nap through parts of the day, and wake to enjoy a beer or drink and then back to a nap ...while others work inside during the best time of the day....
It is a surprisingly peaceful and fulfilling gig...
For now.....
for the time being..

For most of my shift (9/10 ths of it ) I sit back in my chair, plug my work harp into my n900, spark up gtkgep, out it to the office sound system ...
and jam every night while watching the cameras...
sometimes work on an illustration or carving design to break the tedium of just playing tunes...
the very odd time listen to audio books of ancient philosophers...
Not too shabby a way to spend a night..

(So yeah...
For a while now...I have been fixated on gtkgep on my n900 when not near one of my home laps running linux with more profound and comprehensive rt progs.)