CD-Text is Hardware read and write dependent.
For instance, HP CD-Writer (8100, 9100) are CD-Text compliant. If you use Goldenhawk CDRWIN, last versions are able to write CD-Text data, and to read it via their GUI.
Yes indeed, a CD-Text option could be very usefull in Winamp ! Just do it guys !
For the time being, there is yet CDDB...