I have not yet created a TFSA, nor invested anything in it. I am looking to put some money in in 2011, what will my cap be?
All the gory details are available here.
More specifically your personal limit will be listed on you last tax assessment notice, that you would have received last April-ish when you filed last year's taxes.
As a first approximation, your situation may differ, if you have never contributed anything, your limit is likely $15,000 (as the program has been running three years as of 2011).