I guess the "make everything social" decree went out to Google Scholar as well.
There is now essentially a scholarly social network built in - individual user profiles displaying citations, links to colleagues.
Today we’re introducing Google Scholar Citations: a simple way for you to compute your citation metrics and track them over time.
You can enable automatic addition of your newly published articles to your profile. This would instruct the Google Scholar indexing system to update your profile as it discovers new articles that are likely yours. And you can, of course, manually update your profile by adding missing articles, fixing bibliographic errors, and merging duplicate entries.
You can also create a public profile with your articles and citation metrics
Google Scholar Blog - Google Scholar Citations - July 20, 2011
There's more information at http://scholar.google.com/intl/en/scholar/citations.html
Citations is in limited release, you have to sign up on a waiting list, usual procedures.
Here is the profile for Anurag Acharya: http://scholar.google.com/citations?user=nGEWZbkAAAAJ&hl=en
UPDATE 2013-11-21: Google Scholar has added a personal library feature. ENDUPDATE
November 20, 2004 Google Scholar (my first mention of Scholar, shortly after it was launched)