Thanks for all the feedback. Some answers to some of your questions:
Plugins: the emulator does not support plugins and probably never will - not using plugins allows the emulator to be more efficient and stable. Also I think that configuring/choosing plugins can make it difficult for newbies to get started. Working straight out of the box is a major plus for me - when I want to play a game I don't want to have to mess around with plugins and configuration - I just want to play it
Compatibility: I'm not sure how pSX compares with ePSXE or any of the other emulators - I expect its fairly similar because I've been working on it a long time. I have completeled many RPGs using it
It should run on quite low spec PCs - make sure you have DX9 installed - if not send me an email an I'll try to figure out whats wrong.
PS2: yeah - I am working on PS2 emulation - it doesn't run anything commercial yet though...
Registry: it does not put anything in your registry - all options are stored in psx.ini (which you can hand edit in notepad if you want).
Games not working: I'll try to look at some of these soon - I know about Tekken3, but the others are new to me...
Thanks.