The FTC has issued some new rules about disclosing where your blogging revenue comes from (what revenue?). You can see the document here – http://ftc.gov/opa/2009/10/endortest.shtm
As of October 2009 I have not gotten any free anything (or money) from anyone in return for equipment reviews or favorable mentions on the blog. I do run some ads from amazon.com and google.com but I have not actually gotten any money from those ads so far.
I have asked a couple of companies to send me products for review but that has not happened so far.