Perfume

Just listening to so many of my friends who've jumped into the BPAL hobby makes me wonder - is there a site that will give me "readers' advisory" service for perfumes? An "If you like these few perfumes, you'd probably like these others" thing? I have three or four scents I use recurringly, and there must be others with a similar-but-different personality that I'd like.

(ETA: Burberry "London"; Guerlain "Champs Elysees"; Bulgari "BLV"; Chanel "Cristalle")