I am so, so, so sad that Yahoo! shut down Geocities, because they took with them the Pokemon fan website that I made when I was just learning this whole 'HTML' thing for the first time.
I even remember the exact full URL of the website[0]. But between the demise of Geocities and the demise of my 386's hard drive, that piece of nostalgia is gone forever.
I remember dedicating a page to all of the different "strategies" to catch Mew in Gen I games, before we all collectively decided that this was impossible to do without a Gameshark[1]. Little did we know that there was a technique - it just wouldn't be discovered until ~2003[2]]!
[0] For those just tuning in this century, Geocities would provide webspace (that's a word I haven't used in a while!) and your homepage would be a URL of the format http://www.geocities.com/Foo/Bar/1234
[1] "When I was your age, Action Replay was a Gameshark..."