I would only go with a domain hack if the .com is also available. A certain portion of users will type in the .com version, and if you are popular enough, the

I would only go with a domain hack if the .com is also available. A certain portion of users will type in the .com version, and if you are popular enough, the owner of the .com might be malicious enough to capitalize on it. e.g. http://del.icio.us http://del.icio.us forwards to http://delicious.com/ http://delicious.com/, but imagine what would happen if they didn't own the .com.