Alas, I can not sign up to Omnidrive. As of July 2008 they are posting the following message:
"Omnidrive is currently in Beta, and we have reached capacity in terms of number of users. We expect to allow more user signups during late May (a small run while we roll a trial of the new 1.0 version) and then expect to completely open signups up again once the 1.0 version of the product is launched. Currently a firm date for the 1.0 release has not been set, but we anticipate that most users will be migrated to it during June, and it will be open to all new users in July."
Given it is now July, it looks like I might have to wait a bit longer.
Learning 2.1: Online File Storage with Omnidrive