Avoid 302 redirects, they pass no PageRank. 301's do dampen PageRank as well, though the exact amount is not known. I've always put it around 10-15% (i.e., aft

Avoid 302 redirects, they pass no PageRank. 301's do dampen PageRank as well, though the exact amount is not known. I've always put it around 10-15% (i.e., after each 301 you are left with 85% of the original value). I also suspect that its contextual - so a 301 from www.mydomain.com to mydomain.com would probably be dampened less than a 301 to a completely different domain (e.g., bit.ly).