After looking over the forum I'm utterly confused which SD card to buy. Some people say class 4 is most stable, class 6 is faster but less stable, and class 10 cards wouldn't even boot. But now I've read that class 10 cards okay? I think I'm going to get either an 8 or 16 GB Transcend class 10 (they're very cheap here). What is the state of class 10 cards and the Raspberry Pi now? Are class 6 cards still considered better?
Its not so strange that you are confused, as the situation concerning SD-cards is very much in flux, and some info is now outdated. So yes, the situation was
that Class 10 cards wre a problem, until someone noticed that the GPIO's the interface used someone forgot to enable some pullup resistors, after that most class 10 cards started working! Obviously cards can still be problematic, especially as there are fake cards, that claim to be 2GB, but are actually 1GB. Hopefully the wiki should be fairly up to date, as it can constantly be updated, unlike other resources (no guarantee there though).
Okay, this is something I'm totally unfamiliar with. I'm looking for something to power not only the RPi but a powered USB hub (for peripherals) for an extended period of time (a couple hours would be nice). I know there are portable USB supplies, but has anyone else used these to make a powered USB hub? If I buy a power supply with USB output, replace the power and ground leads in a (non-powered) USB hub with those from the PSU's output? (btw, I'm an EE student so I'm not afraid of soldering some wires, I'm just not sure what to do with USB). Does anyone have any suggestions for good PSUs or USB hub configurations?
Same situation as for the PI itself, if you want a portable system, you will need a portable power supply that provides exactly 5V at the required currents, many people use a 9V or 12V battery, and a cheap cigar plug USB output converter, as used to power USB devices such as iPods in a car.
I suppose once I get a portable powered USB hub working, wifi is fairly straightforward as long as I use a compatible dongle (I've seen the list, things are looking pretty good for RPi and USB wifi). Does anyone have any suggestions of which dongle to use? Range isn't that important, I just want to be able to keep a connection with my router or PC through some walls at most 100 feet (30ish meters for those of you not in the US)
The most I can say is that most WiFi dongles won't work directly on the PI's USB ports, and require the power from a powered hub. For portable systems I would recommend a low power device, that is one based on a low power conscious chip set. But obviously one for which open source software exists, especially as the code needs to be compatible with the ARM6 architecture of the PI.