Priority Club has sweetened their offer of points for signing up with Directv from 15,000 to 25,000 and up to 50% off for the first year.
The deadline is May 31, 2010.
I took advantage of this deal back when it was a 15,000 point offer. I had a bear of a time getting the points though as there was not a spot to enter in my Priority Club number during sign-up.
This probably has been fixed by now but I would recommend printing the offer and your final confirmation page as backup.