I've uploaded an 11x17 poster template (cmpsc220-poster-template.odp) to the protected area of the course website.
Ideally, if you can email me your poster by the end of Tuesday, I think that will give the print shop time to run them. (Put another way, I'll walk into the shop Wednesday morning when they open.)
I found that there is very little space on an 11x17 poster. Once you include a diagram or two (screenshot, whatever the case may be), there is very little room for text. You should find that filling the poster isn't the problem, but finding room for what you do want to say might be problematic.
I'll be uploading (to the protected area of the site—they will not be on the Interwebs at large) team pictures that I've taken so far. Emails will ensue.