Melbourne Hotels near Sebel Albert Park

I am attending a conference at the Sebel Albert Park March 11-14. I have several overseas associates who want to come but can't confirm until a few days prior. Can anyone recommend hotels close to the Sebel, in case it is booked out.
thanks Buzz. Have passed on the hotels, and given them some instructions on how to use wotif. These guys are from Singapore and Taiwan and haven't used wotif before.....and I haven't used it a lot myself.