I built apps on Turbo Pascal on a 486 I had (and still, as it happens, have) and transferred them over to it, games and such mostly. I also plugged it into a modem to dial in with the terminal emulator when I was out and about. The only downer with the 95LX was the small screen width, but it was a lot more convenient than the Atari Portfolio. I have a Portfolio, mostly as a curiosity, and on balance the LXen are the better machines even though Portfolios are really quite sexy.
When I lived in Malaysia for a few weeks, one of the doctors at the hospital there was practically conjoined to his 100LX. He did remarkable things with it.
I'm pretty sure I picked up the GEOS OmniGo too (OmniGo 100, IIRC?). I was not a fan of GEOS on the C64 or the Apple II, just too slow for practical use. But GEOS on the OmniGo was a surprising pleasure. And there is a ZEOS pocket PC (cheap piece of ...) and a Poqet PC around here somewhere also, but the LXen are my favourites.