Onlywire - Submits to 19 Top Sites with 1 Click.

The Socializer  - Helps to automate Submission to over 50 sites.

Only Submitter - Autofill Firefox plugin that has over 80 Social Bookmarking Sites built in. It is the first and only customizable submitter on the market.

Unalog – Another great one that I use all the time.