To register for OWL, go to this site (please make sure to enter your UIUC netID or UIN for your student ID in OWL). The key for the Chemistry 204 OWL course is E-XT9WYFYBNMNY8.
If you are interested in research, here are two links for Chemistry and Chemical and Biomolecular Engineering.
Want to see some "beautiful chemistry?" Go to http://www.beautifulchemistry.net/reaction