I had no idea - just got an email from DRFBets:
"We regret to inform you that the Illinois Racing Board has requested that DRF Bets, powered by Xpressbet, cease accepting wagers from residents of Illinois. Effective Friday, January 18, our Illinois customers will not be permitted to wager at DRFBets.com until further notice...".
Just found more info from bloodhorse.com.
The Paulick Report seems to suggest that this applies to racing at Illinois tracks, but the email above doesn't seem limited to that.
I guess I have some free time this weekend. This stinks.