We’ve given you Spamhaus’ and Commtouch’s view of the State of Email, 2005. Here’s what Symantec sees:

Symantec’s State Of EMail, 2005 vs 2004 Growth %
Bot Networks 17%
Phishing 300%
Software Vulnerabilities 112%
Spam 177%
Viruses, Trojans, Worms 164%

Keep in mind that each analysis is only as good as the sample taken. Nevertheless, the sample appears to be fairly representative… except for the botnets.