Any site we can keep track of all accounts we have in different social networking sites in that ONE website?

[Gold]

http://swimwire.com/
Swimwire is a social network and online media aggregator – you create a simple free account and Swimwire can put these all together, saving you time and effort telling people lots of different links – you just tell them your Swimwire one, and then others can find you everywhere online.

http://friendfeed.com/
FriendFeed enables you to keep up-to-date on the web pages, photos, videos and music that your friends and family are sharing. It offers a unique way to discover and discuss information among friends.
Sign up for FriendFeed, invite some friends, and get a customized feed made up of the content that your friends shared — from news articles to family photos to interesting links and videos. FriendFeed automatically imports shared stuff from sites across the web, so if your friend favorites a video on YouTube, you get a link and a thumbnail of the video in your feed. And if your friend likes a news story on Digg, you get a link in your feed. FriendFeed makes all the sites you already use a little more social.

http://www.trigga.me/
Trigga.Me enables group based updates for Social Networks.
* Organize all your social networks in groups * Keep track of your friends updates and replies from different sources * Safe storage of your passwords

http://8hands.com/
8hands is a small and friendly desktop application that presents a concise summary of all your online social networking activities (your MySpace & Flickr profiles, your blog, etc.) with useful statistics (the number of friends in each network, activity meter, etc.). With 8hands you can always stay connected to your favorite networks and your network friends without having to check your various profiles on each and every site.