I'm using a Petro canada sim in my iPad 2 (had to cut it to make it fit) then I signed up for the unlimited browsing at 10 a month. I use it alot, some apps web browsing, email (needs to be setup as exchange account) twitter Facebook and even streaming radio work well. The only problem is that images load a low quality version because of the proxy. But it's unlimited and is a great option to try to see if it meets your needs. (I tried tracking for awhile and 500 mb I can go through in a couple of days)
iPhone 3GS Petro canada mobility
$49.95 unlimited plan
Ipad2 with Petro canada browsing plan
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