In the June issue of Arthur Frommer's Budget Travel magazine between page 28 and 29 there's a Priceline ad where you scratch off an area on a "briefcase" William Shatner is holding to get a 6-character code.
The code is good for $25. $50, $75 or $100 in hotel bonus cash for name-your-own-price hotels. You go to a special page on their website, enter the code and your e-mail address, then go to a second screen where you enter the PL password linked to the e-mail (like logging in) and then they tell you how much bonus cash you've "won." They send an e-mail with that info and links to the e-mail you gave.
I won (surprise!) $25

and, in digging deeper into T&Cs, I see it's $5/night for up to 5 nights.
YMMV, but odds are you'll probably get the $5-off x 5 as well. Nothing to write home about, but useful for a little extra boost if using PL for something anyway. Maybe you'll even beat the odds and get a bigger discount. You have until 8/31 to book, for stays through 3/31/10.
The ad may well be in other magazines besides Budget Travel; that's just the one where I found it.
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Don't forget the Expedia UK deal is still going. $30-off for new accounts and no minimum stay or minimum to spend. PM me WITH E-MAIL ADDRESS and I'll have them send a code to you. The e-mail can be a junk e-mail, though they promise not to send spam.
You don't have to live in the UK to use it (works fine for U.S.-based addresses and credit cards), and in places like Las Vegas it's even possible to get rooms for only the booking fee ($1-$2). Otherwise it works best on single-night bookings. It's strictly one code per e-mail/account, though, so each code needs a separate e-mail PM'ed if wanting more than one.