I found something new out there called "Flash Sales". They're sales that are usually for a short period of time on a specific date. During that time, there will be huge discounts.
Here's one for August 10 and 11, 2010. It begins at noon and is for 24 hours only. It ends at noon tomorrow. It's Anne Klein and they're offering items up to 80% off. I'm not an Anne Klein shopper, but if you need good work clothes, shoes, etc. you might want to check it out at http://www.anneklein.com/Anne-Klein-Event/90483630,default,sc.html?ep_tag=AF200905.
One example - a little black satin dress that's normally $178.00 is on sale for $61.99. I'm going to post more of them as I find them!