I noticed that the new photofriday included a monitor adjustment. I also found this older article on flickr central, which goes into a far bit more detail about doing the tonal adjustment for you computer monitor and its just as relevant today.
It is not me that benefits from you doing this, it is you that benefits. You will be able the better appreciate the effort good photographers have undertake to capture well balanced and rich tonal ranges.
If you are serious about looking at photos on-line check out the test strip above (it shoud show 17 shades of grey plus black and white. Commonly it is the strips at either end that might look the same. Dive into the post to see what needs to be adjusted