OK, so looking into the actual implementation of BBCode, I realize now that it's not something I can do myself b/c we don't have access to the files that parse the BBCode into HTML.
So, when I type:
[url=http://wikipedia.org]Wikipedia[/url]
it replaces the code with:
<a href="http://wikipedia.org">Wikipedia</a>
Personally, I prefer it replace the code with:
<a href="http://wikipedia.org" target="_blank">Wikipedia</a>
Since it's not fair of me to ask you to change this for everyone, any chance we could have this as an administrative option or possibly an additional BBCode to use?