Determine the version of a ruby library

I always have trouble remembering details of my ruby installation. Here's an example of how to find the version of rexml that is on your machine.

ruby -vrrexml/rexml -e 'p REXML::VERSION,PLATFORM'

I stole this example from this link.

Mobile Internet

I saw an interesting post entitled Is mobile Internet really such a good thing? (h/t BoingBoing). I have not studied the mobile industry, but I have often thought about it. I guess that my biggest take-away is that it is dangerous to have the expectation that the mobile internet will react the same as the internet to new ideas. It's an entirely different beast (particularly if your intent is to monetize something).