While they may not be available on the US PlayStation Store, a number of PlayStation Eye games have been up on the EU store for a wee while now. A member of the PS3Forums community, Kungfuruss, has recorded a number of video reviews to let you know whether they are worthy of a download or not. All of these reviews are available on his YouTube account.
Be sure to check them out if you're still on the fence about downloading the £1.99 titles. Or if you're not in the European territories, then be sure to watch them to see what you're missing. No doubt Kungfuruss will continue to record more video reviews as more PSN titles come out - we'll be keeping our eyes out for them.