So I went nosing around the llamasoft message board today looking for info about the new game that Jeff Minter is making for XBLA (http://stinkygoat.livejournal.com/85730.html - scroll down for pics) and much to my interest I found that somebody there was pimping a stripped down Jag emulator specifically for Tempest 2000. Since both the standard Jag emus died before they got to a decently usable state, I thought i'd have a look as T2000 is the only reason that I wanted one in the first place.
Getting to the point, it runs the game at full pelt without any noticeable issues so far short of the 2 player mode not working. The emulator itself its reasonably featured and its only really lacking remappable controls, which hasent bothered me much as it plays fine with my pads and I can program the layout into the XA if I want to use it. I'd usally gripe about the lack of scanline effects in an emulator, but its a bit of a non issue in this case since its a mostly vector game.
For the benefit of the folks who havent played the game or can't remember it much, theres not much to say about it beyond the fact that its a hotrodded version of the original Tempest. Its got fancier graphics, power-ups, bonus stages, dodgey 90s techno music and some different stages to the original. Milage may vary depending on how much you like Tempest in general, but I think its great and its one of those rare examples of an early 80s classic getting remade into a game thats actually worth playing.
Once again i'm too lazy to make screenies when there are plenty on the net already, so you can see some here - http://www.mobygames.com/game/tempest-2000/screenshots
If you want to give it a go, you can find the ROM in the usual places and you can grab the emulator at http://www.yakyak.org/viewtopic.php?t=41691.