Rated 3 out of 5 stars
A good sharing extension, which plays well with my system, and unlike ShareThis it doesn't demand FaceBook privileges. Unfortunately, the list of shared services on the extension page is a bit deceptive. Upon installing it you'll find no support at all for Read It Later and several other excellent services.
Also, it would be greatly preferable if sharing via Delicious (and similar services) triggered a popup window rather than a new tab.
If these are fixed, Shareaholic would get a 5.