My strategy, having not read the other responses:

First of all it has to be an non-dominated trapping hand that no one sees coming, for me to elect to cold call a raise.

Namely,

22-TT
45s-TJs
35s-9Js

I never call raises with unsuited connectors. That extra 4% or so chance of winning with a flush adds up over time.

I will elect to call raises with hands like this base on the following parameters.

1) Late position (always)

2) Stack depth. If I am doubled up to $50 at a 25nl table and another big stack raises PF, I am highly likely to call with these hands in an effort to become a $100 stack. Implied odds make this profitable.

3) Pot odds. Not quite as important, but if theres an 8-way family pot developing and I have a suited connector, I am highly likely to make this call.

Also these parameters need to be much larger to facilitate a call with suited connectors rather than pocket pairs, which don't need quite as much. I will limp/call any pocket pair in any position unless the raise is just disproportionately large.