The Average Resume
We recently did a little experiment, fine-tuning and testing our API (more here: http://www.twentypeople.com/api/). One of the things we were evaluating was filetypes.
What file format is your resume in?
We were surprised to see that based on a set of one hundred resumes, Word documents (the older .doc format) were the most prominent format.

Average Number of Words
Now, the other thing we tried to investigate, was the average length (in words) of a standard resume. Again, we analyzed over a hundred resumes and learned that typically, people need around 2026 words.
File Size
Out of a hundred resumes, only one had more than 1 MB (a PDF, with photo). Six resumes were over 100KB (which is still fine), and most files were between 10KB and 90KB, which is really impressive and would be considered professional.