mtbr - but the only really meaningful reviews will always be a year old. Ignore the positive ones, read the negative ones, test ride, take it all with a big pinch of salt and then make your own mind up.

Alternatively, for bike/parts reviews, then either trawling the internet via a google search or, if the bike I'm interested in is on long term review, in DirtRag and Bike magazines I'll read those. Either way I try not to buy without checking form, fit and function first.