For those that want a blast from the past and want to relive the old Windows 3.1 operating system, or the somewhat newer Windows 2000, these sites are great at recreating the experience for you. Very detailed and a lot of time had to go into these. Definitely brings back memories. A bit of caution, though: The Windows 2000 site is only supposed to work on Internet Explorer. I didn’t do a lot of thorough testing, but it worked alright on Firefox 3.6 for me…