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It depends on the types of camcorders people are shooting their video on.
But ideally you should have a common format that they will all give you their video in. You definitely do NOT want to mix raw media from a variety of sources or you will run into all kinds of problems!
For standard definition video, demand they all give you their video in either DV-AVI (for PCs) or DV-MOV (for Mac) format. 720x480 with the DV codec. This you can combine in a project set up for DV.
For hi-def, demand they all give you their video in 1440x1080 MTS or M2T format. This video you will be able to combine in a project set up for HDV.
These are very standard formats and resolutions, and every editing application should have the ability to output in these formats. But, as I say, demand that it be in a standard format or your job will be like herding cats.
I agree with Steve, and his admonition on not mixing vastly different formats.
Now, Adobe's PrPro CS 5.5, and especially with a CUDA/MPE card, does a much better job at allowing one to mix footage, but at a much higher price, plus for smoothest editing, a fully certified CUDA nVidia card. This ARTICLE will give you more info on PrPro CS 5.5 and CUDA/MPE.
Otherwise, choosing a "master" format/COCEC, and either getting the Exported/Output footage in a matching format/CODEC, or doing a conversion to that chosen "master" format/CODEC, will solve tons of potential problems.