Doing a few google serches I see that iTunes can export to txt or html. I'm not sure how or what it will export.

What software did you originally rip the CD's in?

EAC has an option to export to local freedb, cdplayer.ini or db text file.

Tag & Rename has export options to CVS, XML, HTML, tab delimited.

I would check to see if any of these services support getting your current tags from you and using them when they rip the CD's.