Do you need to check how your website look on combination of browsers under different operating systems? Try entering the URL on the first page of the browsershots website.
Just choose the browsers you want to test under each operating system (no MAC OS available) the browsershots service will produce a series of images which area available online for 30 minutes, but that you can download and save for a more careful analysis.

If you want to find out which of the binary versions of some file you are running under Cygwin you can try two commands: "which" and "type".
 
type -a ruby
 
Should return something similar to:
 
16:55:17 ~$ type -a rubyruby is /usr/bin/rubyruby is /bin/rubyruby is /usr/bin/rubySo would this:
 
which ruby
Cheers!

Some time ago I wrote a post on my blog on how to setup the looks of your Cygwin bash shell using rxvt. Well, I normally add a few more settings to my environment just to make it more useful.

For instance, I add the following lines to my ~/.bash_profile with some aliases to make it easier with directory surfing.

alias ls='ls --color=auto' alias ll='ls -lsa' alias l='ls -la'