I love Sk*rt. You can think of it as "Digg for chicks" (in the words of QueenofSpain), and it features the user-selected stories in topic such as Arts & Entertainment, Design & Crafts, Family & Parenting, and Food & Home.

When it comes to social media tools, most are not gender specific.  That's a good thing, as it means they can be uniformly useful for everyone, but it's a sign of evolution when more specifically targeted sites start to appear.  It happened with websites and now the same seems to be happening with several new interesting social media tools popping up targeted at women.