Trading is a bit fiddly and this app costs a few quid but it does work.
http://www.iteleportmobile.com/connect
Make sure you buy the ipad version if you do go for this.
Essentially it allows you to download a free app to your computer and then access your desktop via the app on your ipad. Its pretty cool but I haven't used it much yet so I don't know as I would actually use it to play a lot but certainly to check out my resources and maybe chuck in a quick last minute trade before sleep I reckon I'll use it.
Of course there are plenty of other advantages as I can now access any document or programme on my computer when I only have my ipad and also monitor what's going on on my pc too. (Muwahahahaa!)
Anyway seemed like something people would want to know about. I saw it from some guy on youtube who was using it to play poker..im going to probably use it for that too
Firefrog