I do believe that volunteering at you local precinct is important and needed. The kind of effort I'm talking about here though is more along the lines of freepers nation wide parsing the voter rolls of Columbus, OH, for instance.
I am hoping it could work along the same lines as the SETI project does. You take thousands of processors (in this case freepers) and give each a small chunk of a very large pool of data to process.
From what I have read, there are ongoing investigations/indictments/convictions in FL, KY, OH,IN,NV & TX. State officials, elected and LEO are involved, as are the Feds.
Here are two instances. Much of this goes on in local elections. Much of it is Dem vs Dem
http://www.sptimes.com/2004/09/28/State/Vote_fraud_case_raise.shtml
http://www.kentucky.com/mld/kentucky/news/local/9778199.htm
Volunteer in your state in contentious precincts for poll watching. Take the training. If you see anything at all suspicious in the time leading up to the election, report it to the GOP. They will know how to handle it, especially if your State Election Board is Democrat controlled.
I have been informed that even w/fraud, we have the votes in OH. Vote fraud is now, after the 2000 General Election, a Federal felony. AFAIK, the various state registration officials are working overtime, have hired more people and are cross checking new registrations. In some areas (sorry, I don't recall this one, may be that NAACP effort), the Dem 527s are NOT registering very many new people.
We won in 2000, when we were less prepared for this. We won in 2002, after we became more proactive in ferreting out fraud.
Volunteer and take the training. I don't think we have the ability to parse voter rolls across state lines. It would leave us open to charges of fraud, ourselves, IMO.