A quick note to TimO:
I wanted to put your site through it's paces so I did. Many of the sites links are invalid. Why? Because you are allowing indirect linking to demos. By that I mean you don't give a link to the homepage of the company, instead you give a link to the bulk downloads area of a game demo site. Unfortunately game demo sites only keep demos online for about a month or so and then they are gone.
The safe bet is to link to the company/game's homepage. Not a link to the file directly, but just the front page. Those rarely change.
Keep up the good work....
HAC
Edit:
Something that's also of note is that your "needs trackball" status is completely off.
For example, ball of steel has a completely mouse driven interface, not only that but you can't use keys to navigate either. So obviously it does require a trackball to be played on an arcade cabinet. Many of the other games are similar, e.g. they do indeed have remappable controls, but the keys to navigate through the menu to start the game are hard-coded, therefore the keys aren't remappable for all intenvise purposes.
I'm not trying to rag on ya, I'm just offering some suggestions.