Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
The XT and newer Canon cameras use the FAT32 file system, so you will have no problem using 2GB or larger memory cards. I use a 4GB in mine with no trouble.
If you shoot teathered to the computer, the camera should be able to upload the picture to your laptop. My Digital Rebel did that back in the day with the supplied Canon software, though I don't think it had the option to continue shooting pictures every X seconds for Y hours...
BTW, will the battery even last that long? I don't ever remember being able to take 2,880 pictures in a row (12 hr, 4 pic/min) on a single battery with any of my cameras...but if you plan on taking that many, look into the AC adapter kit that lets you run the camera off of a standard home power outlet...
The XT will even take the 16gb CF Cards I believe.
For time lapse (where possible) tethering to your PC and using the Canon remote or other remote software is the best idea since you get to use your HDD for storage of all those photos
A buddy of mine just bought this timer made by Canon and modded it to work with his XT. He said it works sweet. So I am gonna order it and let you know.
So far it's easy:
Install the latest drivers for the Canon.
Install DSLR Pro.
Make sure it's switched to "computer" and not "PTP" in the settings for connection.
Connect the camera with the USB cable.
Grab a tripod.
Mount the cam.
Change a few settings and follow the instructions of DSLR Pro.
Run the application.
From there you will need a video application to compile the images. You can grab a ton of free ones (check the shareware thread). Set the FPS to what you like and that's it.