[FrustyCronch]

Is there a way to view (not necessarily interact with by adding data or updating) your OmniFocus data online?

[Lizard]

OmniFocus has an option to export as HTML or plain text. You could do this and then put it on your MobileMe account, or a similar webservice that lets you upload files, or even email it to yourself to read it from anywhere you can check your email. You'll have to re-export frequently to make sure that document stays up-to-date.