@Admiral935: Unless your encrypting your messages before sending from your local machine, your connection to the internet (wi-fi or wired) is really irrelevant to the security of your email. SMTP does not use encryption and there are any number of servers between your message and it's intended recipient, where your communication can be compromised (say hi to the NSA).
Using an open, public wi-fi may put you at greater risk of having a session sniffed and a login token hijacked, but there are a number of other ways for that to happen that don't require the wi-fi at all.
I hope you're using SSL to connect to your email server, and Https for webmail. I wouldn't do any online banking at the cafe regardless, but does anyone really want to read your email? Script kiddies maybe, just because they can. But, if you really are sending messages that should not be read by strangers you should be using a VPN and/or encryption no matter where you connect (which still probably won't stop the NSA from reading your email, but that's another issue).
Some informational links:
http://luxsci.com/blog/the-case-for-email-security.html
http://cybercoyote.org/classes/wifi/hotspots.shtml