The current favicon doesn't look too good, as it's just a scaled down version of the big logo.
It would be nice to have something a little bit more clear to look at.
I've redrawn the logo in favicon size (with 4 variations), making it look a lot more clear:

I'm currently using the 2nd one, both in my search bar and on the actual site (userscript).
I would be pleased if one of these or a better design were used instead of the current one.