livejournal ohnotheydidntWhat type of lens would take pictures like these: http://community.livejournal.com/ohnotheydidnt/21740273.html

I only own the lens that the Canon Rebel comes with.
If you look closely, the tele shots are crops -- check out the crummy quality.

And for the lens to get the close-in shots, it has to be wide.

So it's an 18-135 or so.

HTH
V
Big time telephoto, like 300 or more on a digital camera or 400 or more on a film camera.

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Note the image compression. That distant GMC truck is at least 60 feet away, but it looks like it's right over her shoulder.
The lens you have would do most of them, the rest wlivejournal ohnotheydidntere probably shot with a medium telephoto 70 - 200mm or so.

Chris
probably a telephoto lens something like 75-300
The EF18-55 will do some nice things but to reach out like this shooter has you need something with a good range. Judging from the flattening of the depth, I'd guess it's about 300mm but that's just a guess.

For some really good range and a great piece of glass for your Canon at a fantastic price - look at the EF70-200 f/4L. You can have one for less than $600 these days.
Yes, Dr. Sam is correct.

livejournal ohnotheydidntMost of the shooters are using 400mm f/2.8 or 600mm f/4.0 lenses (the same as the sports photogs do).

Sell your Corvette or Harley and step up to the plate
They may be using a long telephoto, but some of the shots are obviously cropped. Looks like there were using either a high ISO as well. Although the questionable quality on the crops could be from too much compression(JPG artifacting), cropping too deep or high ISO noise.