http://bugs.winehq.org/show_bug.cgi?id=17106
--- Comment #3 from Alan J Richardson ajrich@earthlink.net 2009-01-25 16:19:30 --- 64 bit Fedora, wine installed through their repository (tends to lag behind the official release, 1.1.9 is the latest version they have packaged)
tahoma.ttf and tahomabd.ttf exist in wine's fonts folder. (installed them through winetricks and retried before filing the bug)
There is one other report of invisible text, on the appdb page. Joel claims that Steam was working until he reinstalled, whereupon text became invisible.