Senator Frist's number is 202-224-3344. Oddly enough, his line is busy.
I was able to get through on Frist's other line (a TN number I think). It is: 615-352-9411. I also sent letters to him, Bush/Cheney and all the other Judiciary committee members.
I think the best option would be for Grassley to step down from his position on the Finance committee giving it up to Hatch so he (Grassley) becomes next in line for the Judiciary chair (ahead of Specter). Specter can continue to serve on the Veteran's Affairs committee. So the big question is whether Grassley and Frist would go along with such a strategy. I truly believe that in this term, the chair of the Judiciary committee is the most important position in the Senate, possibly with the exception to the Senate Majority leader, Frist.