You mean applying info from a cddb.com (by gracenote) server, or freedb.org (simillar but not gracenote) to your cd tracks. When you have a CD you want to rip, it's very possible it's info is stored on freedb.org, using software like
CDex, you can read the info from a "remote freedb server" and the track names and album info will be applied, the you rip the tracks.