Steam sales manager is another program I created because of the lack of it already existing. It is... One of my less pretty applications (Not that the other are particularly pretty) but it is strong in functionality. The program will allow you to view all sales on steam currently. Download here

Features:

Lists all games on steam right now
Supports region selection to see prices for your area
Supports shop lists, so you can choose what shops you want to see deals from (As you can buy steam codes from many other shops)
Has multi-threading / multi-core so it loads in the background
Uninstall option to delete all data it saves
Debug mode to show the query that is being made
Wish list allows you to add games by title to your wishlist then why they're on sale it highlights them in the colour you selected!
Search for games by typing or using the search form
Show the amount of games currently on sale
Colour highlighting to show how deep the sale is
Opens the link up in steam on your computer