My SL's are Stafford, and will get an APR of 6.8% once they consolidate from what I understand. However, if I were to somehow tranfer them down the road to a bank loan, or whatever, that has at most a 4% APR, then I'd be saving myself at least $90/month.
Any ideas on the easiest way to do this? Are there banks that would accept a large SL transfer anymore? Would it be considered a personal unsecured loan now?

How large is large? There are still banks that will write six figure loans that are unsecured when the capacity and credit support the loan. The loan would potentially lose its student loan status but that cannot be assessed until you know what sort of loan was being written to pay off the existing student loans...

$50k. I would save almost $100/mo. if I went from 6.8% to 4%. What kind of banks do this? Do they care if they were students loans and just treat it as an unsecured loan that would probably require 800+ FICO's? lol Also, most loans only go to 5-7 years. Will they be able to let you pay it off over 10-20?

Nobody is writing $50k loans unsecurred at that interest rate...especially in this economy.