So, you've made posters before, right? No?
Well, then. Aaron gave some good info that would probably be hella useful for everyone. If you've got more tips, put 'em in the comments, please!
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Notes from Aaron [bracket notes by me]:
Stanford's poster page [the template dimensions and those comments don't apply, but good info going around, and templates could be modified to fit your posters]
'The first time I made a poster it was quite an intimidating task and required a couple of printings to get it right. One suggestion is to print it in color on an 8.5x11 sheet.... shrink the page to fit when printing. It should be about "border line" as far as readability.
PowerPoint poster tips [pdf]
In the past I've started with the templates from the Stanford media services.
This link also has some good info on structure to get you started. Plus it makes pop culture references, which I'm all for.
I (and your mentors*) can check them out on Thursday, Friday, Saturday, Sunday... if I'm in the county, I'd be happy to look at them.
Thanks, guys! Good luck!
* probably not on the weekend for your mentors, unless we know where they live; then we could probably arrange something.