Canon Digital Slr Xti
What is a Canon Rebel XTI Digital SLR compatible with?

Can I use these lens:

The Rebel XTi uses CompactFlash (Type I / II) or MicroDrive memory, not SD. So the memory card will not work unless you have an SD to CF adapter.

The lens in your first link is a Minolta lens and will only work on Minolta and Sony SLRs.

Canon Digital Slr Xti

Canon Digital Rebel XTi 10.1MP SLR or the Canon Digital Rebel XSi 12MP SLR? And lens question…?

So I’m looking to upgrade from my Point and Shoot to a nice camera. I’ve pretty much narrowed it down to the Canon Digital Rebel XTi 10.1MP SLR or the Canon Digital Rebel XSi 12MP SLR. (Possibly the 30D, but that’s a bit more pricey) My plan is buy the body only of whatever I choose, and I think the EF 50mm/1.8 lens.
Now here’s the thing, I don’t know enough about photography to really make this decision. I’ve read that you should put your money in the lens over the body of the camera, so is it worth it to fork up the extra 100 dollars for the XSi? Are the features that much better than the XTi?
Also, lens wise. I plan to be mostly shooting social events, weddings, parties, etc, traveling and tourist pictures and maybe some landscape ones. (Nothing professional, just for really nice memories sake ) I don’t want to have to purchase a lens for each, but is there a good one that can be used pretty well for all?

Yes, you do want to learn more about camera systems before you start throwing money at cameras.

Look into taking a class or two in photography and learn how different lenses are used for different shooting assignments and subjects.

Here is a link that can help you see how various lens lengths can effect your shots.

http://www.tamron.com/lenses/learning_center/tools/focal-length-comparison.php

Canon’s newest incarnation of the 18-55 mm IS is a fine lens and will cover probably over 85% of any images you may want to shoot.

To cover everything with one zoom lens, look into the 18-200 mm

A FuzzyClay Tech Report/Review: Canon Rebel XTi (DSLR)