I did some reading about Blowfish the other night and apparently it's considerably faster than 3DES. So I did some real world testing on my local linux box. Using WinSCP to my Linux box running OpenSSH I was able to get 615kbs using 3DES and 766kbs using Blowfish. That's a speed improvement of 25%!

Update: At work with much faster machines (866 vs 333mhz) The speed improvement is more along the lines of 300%!!!