The submitter script I use is
Advanced Submitters www.advancedsubmitter.com
It probally the best out there for experienced submitters. It can take some effort to configure it, but nothing beats it for building your own submission database. Plus it can effectively submit to Link Lists.
If your a beginner or don't want to take the time to build your own database look at
Dream Submitter www.dreamsubmitter.com.
Plus Dream Submitter has a $2.95 full featured trial. So you basically can't afford not to try it out.