Have you got several accounts on the internet and finding it difficult to manage all of them? Then, Fuser makes things easy for you. Fuser is a web service that allows you to manage all your E-Mail mailboxes, Social network accounts and Twitter accounts from one place. Fuser currently supports Gmail, Yahoo Mail, Hotmail and AOL mail for E-mail and Facebook, MySpace and Twitter for Social networking.
Note that its completely Java based and will not run on computers where Java is not installed.
Here is a screenshot of the interface: