Grep is practical:

find . -type f | fgrep -v /.svn/

find .|grep -v .svn

Though it can be done entirely in find:

find . -type f -a ! -path '*/.svn/*'

Nuking .svn directories might work like so:

find . -name .svn -type d -exec rm -rf {} \;

Oops DUPED in 01075

Btw, don't forget about the command:

svn export