AniDB

cant you build in ... or create a program to fill in your mylist url or something or just login
so you can export it?

you can export your mylist. Just Open it and look to the right and read the links. It is called (tadaaa) Mylist export. Under the word util.

No I am not going to make a screenshot so you can find it ^_^

Small Edit:

Of course this is in the regular AniDB, not the client - I just think that this option is nicely done by AniDB at the moment and that PetriW should lie his focus on other stuff - for instance that annoying window-media-encoded-file-checking-horrible-sound-playing thing BennieB caused

Direct link:
http://anidb.ath.cx/perl-bin/animedb.pl?show=export