Digital Video Camera- Where Do I Start?

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So, I'm starting to really get into this video thing, and sharing my digital videos via my blog.

I currently shoot video using my litle Canon Digital Elph S500 5.0, which does a decent job.

I am researching sometime in the near future getting a very compact digital video camera that stores onto a small digital media card, that's inexpensive and would be easy to tote around with my Canon Digital Rebel.

I prefer the Canon brand, but does anyone have any experience or advice with this? The options are so diverse and large, that I'm looking for a good starting off point for my research.