I would be willing to bet quite a bit that Adobe will not be offering anything in terms of Black Friday sales, but you can still save: if you buy the full or upgrade versions of Lightroom 2 and Photoshop CS4 at the same time through www.adobe.com, Adobe will give you 30% off of your Lightroom purchase.
If you are a member of NAPP (National Association of Photoshop Professionals) you can save an additional 15%. First go to the NAPP site and in the Discounts for Members section under software get your promo code. Then enter this promo code when you purchase the software from adobe.com.
Speaking of NAPP, in my opinion being a member is well worth the annual $99 annual membership fee. Not only do you get their magazine, training videos and tutorials, as well as help desk support, but many companies provide discounts to NAPP members: Dell, Apple, Office Depot and the makers of the Drobo to name a few. And best of all in my opinion: free shipping from B&H! Check them out at www.photoshopuser.com
Happy Thanksgiving, everyone! Enjoy and be safe.