An almost-in-passing comment on this post tells you an easy way to turn on anti-aliasing. I tried it on my Ubuntu Jaunty installation, and it seems to work fine. To spare you the need to reference and hunt and peck the original post, here's what I did:
- Open the file ~/.wine/user.reg in a text editor.
- Change the entry
- Close your text editor
- There is no fourth step.
Later addition: There is a more comprehensive discussion of enabling anti-aliasing (including ClearType) here.