I'm looking into getting some interactive LED boards (as well as a Peggy 2 or two), but I need to learn a lot more about interfaces/programming to get these to work. Can anyone recommend some resources to learn about Arduino/programming on a very basic level?

And I'm sure this is an embarrassing question to even ask, but is it necessary to have a PC plugged into a Peggy board to run programs, or does it download what I would write?

Also, would it be feasible to make a section of floor out of the interactive LED boards? I'm thinking that it'd be pretty awesome to have a hallway that illuminates as you walk through it, but don't know if this can be done.

Thanks in advance, and sorry if all of these questions have been answered before.

There's Getting Started with Arduino and we've also put together a list of AVR resources. There are many, many other resources out there as well. Depending on where you are located, there may even be classes at your local hackerspace.

When you are programming any arduino compatible device such as Peggy you connect your computer to a programmer (such as a USB-TTL cable) and your programmer to the device. After it is programmed you can disconnect everything so that the Peggy runs its program on its own. The exception to that is when you are using the computer to send data to the board (as in the case of the video Peggy).

As far as the interactive LED panels are concerned, you don't need to know anything about programming, as they are completely analog and cannot be programmed.

Yes, you could use the interactive LED panels for a floor system, but you would need to work out a support structure for the surface you would use over the panels. We normally recommend clear glass or plexiglass which can be sanded/frosted if you want a diffused surface.

Thanks for the info!