DOMINIK WAGNER  I see your point. However let me point out that the direction of the connection that has to be made is irrelevant. So if one of the two people wanting to collaborate has a possibility of being reachable then you can collaborate. So if you are behind a local firewall, and your partner is behind some nat at home, all he has to do is to do a local port forward. Most modern routers can do this dynamically, so I'd suggest the use of this tool http://michael.milvich.com/portmapper/GUITester.zip for that. Maybe that helps in your case.  
(Version 2.5.1)

DOMINIK WAGNER  Hi There! If you need to work via SFTP or Webdav then you can easily do this by using Cyberduck, Fugu, Transmit, etc. We work very well with these Applications.  
(Version 2.5.1)

DOMINIK WAGNER  And because we like competition make sure to check out Textmate - we'd rather loose you to macromates then to Bare Bones ;-)  
(Version 2.3)

DOMINIK WAGNER  Actually we are quite open about it being not available free for personal use - i don't know where you get the "sneaky" impression. And we provide 2.2 as free download with the old licence.  
(Version 2.3)

DOMINIK WAGNER  The problem is identified and will be fixed in the next minor update.

There seems to be a possibility to add an aim or email to your me card without setting the primary identifier. To fix it, simply add another email to your me card in address book, then delete it again. Do the same with an AIM name and SubEthaEdit will start without any trouble. This little trick sets the primary identifier for email and aim.  
(Version 2.1.1)

DOMINIK WAGNER  If you're still experiencing this problem, please contact monkeys@codingmonkeys.com - we're trying to track this down, and need the current state of the addressbook while this happens.  
(Version 2.1.1)