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I wanted to create random-looking URL-Parameters similar to the way YouTube does it. There you don't have a movie number in the URL, but rather something that looks pretty strange like http://www.youtube.com/watch?v=uaSsAjdF-Bg, so the uaSsAjdF-Bg is somehow a number replacement. Here's what I discovered

• An article explaining the .net randomizer, and the way you would retrieve a number after the other. I'll have to find out how many numbers are generated till it repeats, and if I can use the last random number as a seed to ensure I stay in the sequence.  
• A Wikipedia article explaining the Mersenne Twister, a algorithm that returns a heck of a lot of random numbers without repeating for a very, very long time.
• A open source / free .net class with a bunch of different randomizers, including fibonaci and mersenne twister.
• Another Marsenne Twister code for .net
• The .net Framework documentation explaining the Random object. Apparently it uses the (quote from page) "The current implementation of the Random class is based on Donald E. Knuth's subtractive random number generator algorithm. " It doesn't say how it repeats, but more research turned up a lot of technical stuff, so I assume it's very thought through (though not usable for encryption).