Re: #2, #4. That's cool - I like the nice contemporary look.
After I read your comment, I "got" the infinity concept - very neat - but I didn't get it before-hand, just looking at it. Perhaps that's because infinity is supposed to be lying down sideways on its back... but then that may be a better symbol for a different type of site! ;->
If you want to run with the infinity concept, you'll need to make it thinner - it unfortunately looks like its got big breasts and a fat rear at the moment.