There's now another highly-rated USB logic analyzer on the market: http://www.saleae.com/logic

They sell an 8-bit model for $150 (EZ-Hook clips included), and a 16-bit model for double that. The support software appears to be all open source and has GUIs for Linux, Mac, and Windows. Extensible, too.

I already have the LogicPort, but if I didn't have it, I'd be very tempted by this product. Speaking of the LogicPort -- there have been some nice software updates of late for it too.

Cheers