Connecticut Secretary of State: http://www.sots.ct.gov/sots/site/default.asp
If you conduct business or plan to conduct business in Connecticut, then you need to become familiar with this resource. Particularly helpful is CONCORD, which allows you to search business and UCC records.
Connecticut Department of Revenue Services (DRS): http://www.ct.gov/drs/site/default.asp
This is another very useful resource from the State of Connecticut. It contains tax forms and helpful information on filing taxes and starting a business.
Other links will be added as site construction continues.