Browsing the catalogs and making lists checking it twice time... you have your seed orders ready to go yet? I have to admit this year is harder because i have to make sure i cover all bases.... what are you ordering? Below are some useful sites I can recommend as being best of the best.
Baker Creek Heirlooms:
Missouri seed company that maintains a huge stock of Open Pollinated varieties, including many varieties brought to the USA for the first time. I have personally ordered seeds from them and their service is second to none.