I have recently aquired an IPAQ3800 series PDA. It originally came with Windows Mobile version 3 and I have subsequently upgraded it to version 4. I am already running numerous programs in its whopping 64 MB of local memory.

I have
2 navigational map viewers
2 infrared remote apps
1 voice command app
1 unit conversion calculator
2 media players
2 web browsers
1 photo editor
1 remote client app
1 guitar tuner
1 metronome

...and
DOOM