Windows Ubuntu dual boot - Share files between OS

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http://askubuntu.com – Well I have a netbook, so I can't play games on windows either, no problem. But I'm getting a new desktop PC with better hadware and it will be able to run the most popular games and I want to have Windows on it to play games and software not compatible with ubuntu. I also want to have Ubuntu, as my primary OS, so I will set a dual boot. In this computer I will have a small SSD with both OS and a second drive (a 500gb HDD) to store my files. I want to avoid copying files from one OS to another every time I, ie, download a file. My question is: Is there any way that I could make both OS use t (HowTos)