the W3c has some nice information about how many people are using what OS and what browser, but I'd LOVE to find a resource with information like this about other software. Like what word processing programs have what percent of the market share, etc. The hard part about this is I need a free resource.
If you know any listservs or feeds or anything that talks about software news and releases and things, that would be great too. I just need to be able to know what my patrons are using and anticipate what books I need to buy.
I appreciate any help you can give, and apologies if this is not allowed!