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Yellow has a few different moves allowable and (if you have access to a cheat cartridge or Pokemon Stadium) a bonus minigame. Aside from that there's a few extra NPC trainers dotted around to follow the Anime a little better. However, it lacks an easily accessable Missingno glitch.
Red & Blue are very much the same game, although if you're not glitching / trading, the overall "Base Stats" of the Pokemon exclusive to Blue are a little better than those exclusive to Red. Nothing most people would notice however. The only real differences between Red & Blue are the default colour schemes on a GBC / GBA, and the Pokemon Gengar is fighting during the intro sequence.
Where logic won't work - I will PAL Gamers unite - http://www.gamefaqs.com/boards/277-pal-gaming