Full-text journal search
Chemspy.com is now running a Google hack as a search box that allows full-text journal search from a wide range of academic publishers (excluding Elsevier, ACS, and RSC, which you can search via Scirus and their respective websites separately). It's analogous to checking only the "Journals" box in Scirus but covers Nature Publishing, Karger, Wiley, Springer, IOP, APS, and numerous other publishers' journals. Give it a try and let me know how you get on with "real-life" searches, I've only tested it with dummy keywords like viagra and benzene so far and it seems to work well.
If this is already well-known, feel free to boot this post into the recycle bin.