About the remote desktop thing - there are tons of different remote desktop apps out there, I suggest you have a look on the App Store and see which one you think is best. If you don't want to do that, however, I can recommend iRdesktop. It's a free app and you can find their website
here for support and FAQs.
I couldn't find any video guides on how to set up iRdesktop, so if you use that app you'll only have the text instructions on their site. There is a video
here that covers how to use Runescape on your iPod Touch through a remote desktop app called Jaadu, which is very good but costs quite a bit of money.
And yes, you can browse the Sals forums on your iPod Touch, I post through my iPod quite a lot. Almost all sites that don't use Java or Flash can be viewed on the Touch's browser.