spikey - 10:20 pm on Oct 5, 2006 (gmt 0)

We a/b tested the hackersafe logo and found it *decreased* conversion.
The conclusion I've drawn is that if the overall design of your site conveys trustworthiness the logo will have a lower (or negative) effect than if your design does not. What that "trustworthiness" is will depend significantly on your users, market, product offering, etc.

We've done a lot of research into what we need to do to have our site convey this message (conjoint analysis, surveys, a/b testing). Because of this I think the logo brings down the overall affect (color clash, doesn't integrate into our design, looks somewhat amateur, etc).