a new Stack Exchange site for quantitative finance has come out of beta today!

Quantitative Finance - Stack Exchange

how do I subscribe to receive recent questions?

the rss feed they provide doesn't register as a valid rss in gmail....

is there a way to receive email notifications when questions are posted?

Check it out again, its gotten serious traction this week to the point it seems like something interesting to check daily..
Tons of new stuff the last 12 hours.