Peer Review Systems available as of August 2012
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Best to use software offered at UBC:
- no issues with student privacy on external servers.
- technical assistance is available from people we can email/call/visit and they are quite responsive in my experience.

All the UBC systems listed below anonymously match up each student with work from one or more other students, and provides an online evaluation scheme (rubric).  We have to write the rubric and provide as many training examples for review that we deem appropriate (this "calibration" is very useful in getting students to provide quality reviews).  Even if the rubric is not perfect, students could have some input after a couple of rounds of reviews and 

iPeer
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Does not manage the actual work files, only the assessment.  Students have to obtain/see the others' work somehow outside of this system.  Often used to peer evaluate paper-based posters or essays, for example.  Clunky interface from what I have seen.

Calibrated Peer Review
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Can exchange student worked that is text (i.e. typed in or copy/pasted) but does not handle files.
* New version will allow uploading of files, not sure when this will be available but am checking.

UBC Connect (Blackboard Learn, replacement for Vista)
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Allows file uploads.  No built-in calibration, but students could be required to do some evaluation of given examples of varying quality as an online assignment.  Could also ask their opinions on the rubrics and survey them easily all in this same environment.  This is also a place where solutions can reside if you do not want them posted on the public website.   Smartphone app not currently supported but would be great for this project if added soon.