So you'd like to edit system files in everyone's favorite free-beer editor, but you'd rather avoid the hassle of enabling the root account and logging into it? Unfortunately, a previous hint to do this was broken by Apple's October 2001 Security Update.
However! Don't despair! This sad state of affairs can be worked around by using LaunchCFMApp as follows. Put this line in your ~/.tcshrc (or in aliases.mine, if you're set up that way):
alias bbroot "sudo -b /System/Library/Frameworks/[Enter all on one line with no added spaces except replace [space] with an actual space character]
Carbon.framework/Versions/Current/Support/LaunchCFMApp
[space]'/Applications/BBEdit Lite 6.1 for OS X'"
Mac OS X Hints
http://hints.macworld.com/article.php?story=20021007061234919