Zimmerman's Research Guide, sponsored by Lexis, is one of the best (and vendor neutral) commercial research guides available. As noted earlier, Zimmerman also has a blog (the ZRG blog!) to keep you aware of developments on the Research Guide site. There are two recent posts about Connecticut resources here and here.
Zimmerman's Connecticut page itself is a valuable resource for all Connecticut practitioners. In his periodic review of Connecticut resources it looks like Zimmerman stumbled across one of the big gaps in public access to Connecticut law. Here's the comment -
"One surprise: The Connecticut administrative code is apparently not available free online from the State of Connecticut or anyone else."
That's right. There is no one source for online access to the administrative code - the only source is on the individual agency's websites. And that access is, frankly, hit or miss. At least there is a government page that provides links to the agency websites.