If you're fast and have a bit of time on your hands, you might be able to net a free download of Street Fighter IV on the PC via Steam.

At random times, Capcom staff members have been tweeting Steam download codes for Street Fighter IV via their Capcom Unity Twitter account.

They also tweet other stuff, sometimes game announcements or just happenings in the office. So it's worth jumping over here from time to time regardless.

Since the game codes are coming in at random, it's hard to say when the next one will pop up, but you might just get lucky.