The Master Chief Collection, which is a compilation of Halo remasters, has been dropping onto the PC game by game with Halo 3: ODST arriving on September 22nd.
You can get the Master Chief collection for PC on Steam, and although not all the games are currently available, you can buy the collection now and play through each of the games as they are released.
Some of us have waited many years, holding out on buying the games and a console to play on, in the misguided hope that these games would eventually make their way to the PC. Well, as one of those people, I can finally have the last laugh and play through these excellent sci-fi shooters on my PC with my mouse and keyboard as has always been intended.
Check out the launch trailer below: