I built some Lookup formulas in XLS so that we can crunch any trade evaluations as they come up for the draft. Feel free to download it - the first tab is where you enter pick numbers to evaluate trades - tab 8 lists the picks by team (excl. compensatory picks that can't be traded).

I tried to embed the calculator in HTML and put it on a blog, but that failed.

I also have calculators for the Schuckers Model, which bases draft value on actual player performance -- 1991-2001 drafts vs. player performance through 2010 (data from pro-football focus). I also built a 'mixed model' that averages the Schuckers model with the traditional model.

Enjoy.

https://docs.google.com/file/d/0B2Eu1DDN514kSW0xa3RjeHJpakE/edit?usp=sharing

Also, if you want to nerd-out on this, below is the link to Schuckers' journal paper on the subject.

http://statsportsconsulting.com/main/wp-content/uploads/Schuckers_JQAS_NFL_Draft.pdf