I've recently switched my default browser to OmniWeb 5 and stumbled across this nifty little feature. I like to have all my open web pages as tabs in the tab drawer of one master browser window. Occasionally an app or site will manage to pop up a new window when I really wanted it as a tab in my master window.
There is an easy solution. Open the tab drawer of the new window and you will see it's corresponding miniature in the tab drawer. You can drag and drop this into the master window's tab drawer. The new window that you didn't want will then behave as if it was newly opened and load your default page. The page you wanted now resides as a tab in your master window's tab drawer.
You can also go in reverse and break one or more tabs into a new windows or if multiple tabs are selected then you can create a new window with them as tabs for the window already loaded. The command drop down on the tab drawer gives these latter options.
For me, these features alone are worth the license fee!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040621124529689