Players should always be placed at the weakest position for analysis.
For this year, I've judged the following:

C/LW is a LW
C/RW is a RW
LW/RW is a RW
RW/D is a D

So... THIS year, RWs are as strong as ever.
When/if the statistical providers ever get their positional act together, then guys like Malkin, Giroux, and Backes should all be C only. Guys like Zetterberg, Datsyuk, Benn, M.Richards, Ott should also be C only (not C/LW).

Here is a link to all dual Yahoo! guys for this year 2012-2013.

Also, when I was tracking player-for-player, I used multiple counters to sum the total players at any forward position and also sum them in my preferred position (per above).
That thread is here... but it never took off.