I recently spent a good deal of time redesigning the look of my blog.  At the time when I was trying to pick colors I was either randomly setting the HEX for RGB and refreshing the page or opening up mspaint only to use the color picker. Of course this meant going through the extra step to convert the decimal values to HEX. 

Today I read csano's blog entry about ColorPicker .Net.  It would have saved me a bunch of frustration.  This is just a simple app that does just what it implies and does it well. - josh

What others said:

"I think this tool is very cool and as a web developer, it will help me quickly get colours and hex codes. "

"Very nice, it works extremely well. "

"I like it, and I'll probably use it the same way as you; when I don't want to open up photoshop.  "

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ColorPicker.NET screenshot