Actually LJP is a lot better than Firestorm. It's free and it emulates lots of systems - NES,SNES, GB(С), SMS/GG,Genesis,NGP(C),WS(C),Atari2600
Right, no GBA, but who needs it anyway - it's waaay too slow for 300MHz PXA CPU. Don't let 300MHz thing fool you - floating point performance of PDA processors is horrible - Pentium 166 MMX will be two times faster, it's barely enough to run Quake.
But NES emulation is very good - sound is almost identical to real console, it's fast, there's still some bugs (unsupported mappers, gfx bugs, especially in racing games) but you can play most of NES games without any glitches.
SNES is playable with sound too - some games are a bit slow and SuperFX games look like slide show (w/o sound Yoshi's Island is playable but not very fast) but Donkey Kong Series, Super Metroid, Zelda and many other games are fully playable. Actually i finished Final Fantasy V on my palm. Only really noticiable gfx bug is sprite priority errors in some games, in Final Fight 3 it can be really annoing when shadow is above item not under it.
Genesis is a bit slow, with sound disabled or set to sim and frameskip 1 it's fast enough (49-60 fps) - now house Ordos rules the Dune
SMS/GG - of course it's fast, but compatibility is not very good, at least ten games will show only black screen.
WS(C) module - a bit slow, no sound, Final Lap 2000 is perfect, but there's some symptoms of early versions of Oswan - Guilty Gear Petit 1,2 have "twitching" character sprites, distorted sky in Final Lap Special.
NGPC - compatibility well... sucks. But SNK vs Capcom: MoTM, Metal Slug games are fully playable and quite fast, what else do we need from this system ?
Atari 2600 - again i can't say "all games working", but it's very fast (hey, it's Atari 2600, not X-Box 360
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