Mobile deal sites that list the hotest deals and biggest bargains often based on user submissions.
SlickDeals
Usability: 
m.slickdeals.net/ (xhtml-mp)
User driven deals site. View deals submitted by the Slickdeals community. Good search function.
Screenshots
HotUKDeals
Usability: m.hotukdeals.com/ (xhtml-mp)
HotUKDeals claims to be the UK's largest site for member submitted deals, voucher codes and bargains. Users share deals which other members can discuss and rate. Deals have a temperature rating which is driven by users voting each deal as "hot" or "cold", with the hottest deals appearing on the site's front page.
The mobile edition of HotUKDeals is optimized for 320px or wider screens and has an average page weight of 130 KB. Source: Taptu Touch Web report (PDF)
dealnews.com
Usability: dealnews.com/iphone/ (xhtml-mp)
Popular deals site, Dealnews.com's "Touch Web" obtimized site helps you find bargains on gadgets, computers, electronics and more. With a page size of only 24 KB the site would work on almost all phones except for the fact that the product links require JavaScript which is not supported by many feature phones.
TechBargains
Usability: m.techbargains.com/ (xhtml-mp)
www.TechBargains.com/mobileindex... (wml)
Constantly updated collection of the best deals on tech toys. Covers both online and brick and motor stores.
Spoofee Deals
Usability: www.spoofee.com (xhtml-mp)
Mobile deals site with brief listings of hot deals. Lists hundreds of deals but could be better organized, there is no search or categories just an un-ordered list of current deals 10 to a page.
GottaDeal Forums
Usability: forums.gottadeal.com/ (HTML5)
Only the GottaDeal Forums are mobile formatted. The main GottaDeal.com site is not.
eDealinfo
Usability: m.edealinfo.com/ (xhtml-mp)
Mobile friendly deal tracker lists today's best online deals. There is a search box to help you find what you are looking for. Deals are categorized as "Tech" or "Non Tech" and there are sections dedicated to Dell, HP and Lenovo products and deals that do require a mail in rebate.
xpBargains
Usability: www.xpbargains.com/pda.php (HTML5)
www.xpbargains.com/wap.php (wml)
Listings of current hot deals on electronics gear.
Frugalytics
Usability: frugalytics.com/ (xhtml-mp)
The mobile edition of deal finder site Frugalytics.com lets you browse and search for hot deals in electronics, watches, running shoes and more. Clicking a listing takes you to the online vendor's site, which is not always mobile friendly.
dealdar
Usability: dealdar.com/ (xhtml-mp)
Mobile deal site with a handy store locator. Dealdar appears to find most of its deals by scraping Twitter. Although dealdar claims the site will work on all mobiles, its large pages (50-130 KB) will not load on many feature phones. Source: Oh! Mobile Directory
