Can you use out-of-state accountants?

I'm about to launch an entertainment business with an international talk
show.  I've been working on barter deals with many businesses to keep
start-up costs to a minimum.  Basically, I get their services/products in
exchange for a plug at the end of the show.  Anyway...

What I'm wondering is if accountants for a business must be ... or should be
.... in the state that business is in.  In other words, could an accounting
firm adequately handle the books if they're in a different state?  Or is
there some reason why you should only look for an accounting firm within
your own state?  State tax laws perhaps?  If it matters, I'm in Madison,
Wisconsin, USA.

Scott Jensen
-- 
Peer-to-peer networking (a.k.a. file-sharing) is entertainment's future.
If you'd like to know why, read the white paper at the link below.
http://www.nonesuch.org/p2prevolution.pdf