Using Atomic Web browser I have managed to log into the full MobileMe. The calendar, contacts, mail, etc seem to work, but the I drive won't because of the general lack of a filesystem in the iPad. I have Good Reader to solve that... 🙂
Atomic has options for spoofing several different desktop browsers. Just be aware it doesn't add anything to the webpage experience though (full Java, flash, etc still doesn't work). It's still a much better browser than Safari.