Hi,
I've been using a Slingbox for a couple of years. It's really good. Your home computer doesn't need to be on when you watch the Slingbox away from home. The only software you put on your home computer is the free SlingPlayer - which you need to do at the start to setup up your Slingbox, and then you only need it on the computer after that if you actually want to watch the Slingbox on that computer or change any setup config (unlikely). Some work places block streaming video so that might stop you watching it at work on your work computer.
I have a Linksys WRT54G too, and its dead easy to set up (as the contributer above says the Slingbox instructions take you thru the port fwding setup step by step). You do need reasonable UPLOAD speed with your ISP - typical guidelines are that about 600kbs is about enough for standard def TV. Therefore you dont need massive download on teh computer running you internet connected SlingPlayers cos the signal will only be as good as the slower of your Slingbox end upload and SlingPlayer end download.
Apart from the free SlingPlayers on my work computer and home computers, I also have three paid for SlingPlayer Mobile apps - one on my work cell phone (Windows phone) and it works great over 3G. The other two I run on my iPad, one is the iPhone version of SlingPlayer mobile which also works great over 3G. Yesterday, I replaced my Slingbox Classic hardware with the Slingbox Solo HD hardware and bought the iPad version of Slingbox Mobile - this gives me a fantastic picture and sound when watching my Slingbox over wifi - but I cant yet get it to work over 3G.
I have my Slingbox hardware connected to a Humax PVR 9200T which only I use, so I've got full on timeshifting as well as placeshifting, and means when I'm in a hotel and they only have crap channel selection, I've got all my favourite home channels and recordings right there with me in my computer bag.
At work I now mainly watch the Slingbox on my iPad anyway so office network blocking streamed video doesn't cause me a problem.
That brings me back nicely to my problem - how to get the iPad SlingPlayer Mobile version to work over 3G? I get a "SlingPlayer cannot connect to your Slingbox" message. I dont understand why it doesn't work. As I said above, I have the iPhone SlingPlayer app working fine on the same iPad over 3G, so why wont the iPad SlingPlayer work over 3G (it works OK over wifi). FYI my 3G is Vodafone - not that I think that's relevent cos as I said the iPhone SlingPlayer app installed on the same iPad works fine over the Vodafone 3G. Doh! Any contributions from the fine readership of this forum will greatly received to help me get my iPad version of SlingPlayer working over 3G! Thanks.
Philip.