Got a fresh ISO and tried a CD install on the Avanti 233 I've got at home... it works, however upon reading the package info the GUI installer slows to a dead crawl. The machine has 48 megs of RAM, I'm guessing wildly that it might be the low-memory situation that's causing it. It doesn't seem to be trying to use the freshly-formatted swap partition at all (should it?).
Doing an FTP install on a UDB or even a miata shows the same thing. However this problem disappears in RHL6.2.