If you haven't yet realized just how useful burn folders are in Tiger, this hint should do the trick for you.
Though there's a fair amount of behind-the-scenes stuff that goes on to handle burn folders, all they are to the filesystem are normal folders whose names end in .fpbf. Unfortunately, you can't create (or rename) folders with that extension from the Finder (except, of course, by using the GUI to explicitly create a burn folder). However, there's absolutely nothing preventing you from doing so in Terminal.
Creating a burn folder from Terminal is trivial, but not perhaps so exciting. All you do is type:
mkdir "Your Name Here.fpbf"
Replace Your Name Here with the name you'd like to apply to the new burn folder, hit Return, and you'll have a new burn folder, located in whatever directory you were in when you ran the command.
mv "Your Name Here" "Your Name Here.fpbf"
In this case, Your Name Here is the name of the existing folder to convert into a burnable folder. After you burn the folder, use this command to switch it back:
mv "Your Name Here.fpbf" "Your Name Here"
There's no need to mess around with aliases or the like; burn folders are happy to burn real files just as well as aliases. I'm sure this would be a trivial thing for some enterprising soul to put into a script for the Finder's contextual menu for those who don't care for Terminal. I'd love to see a future version of OS X do away with the concept of burn folders altogether and simply make every folder burnable. (Anybody at Apple reading this?). In the interim, though, this is a good workaround.
Mac OS X Hints
http://hints.macworld.com/article.php?story=2005091721191684