1. US Masters Swimming Website (www.usms.org). Good resource for national masters swimming programs and competitions. Articles on training and technique, etc. For more local issues, including a list of all local masters swimming programs, check out the New England Masters Swimming website at www.swimnem.org.
2. Total Immersion Swimming - Total Immersion gives swim clinics around the country and they sell DVDs and books that provide very basic step-by-step instruction and drills that are intended to teach proper body positioning and stroke technique. I think they do a good job teaching adults who have no real swimming background how to swim. More advanced swimmers can benefit from their programs as well in that it will force them to focus on basic technique and could help to fix bad habits. I learned how to swim by going to their clinic and reading a book that they published. Visit their website at www.totalimmersion.net.
3. Swim 2000.com - Web Site that offers a wide selection of swim equipment and apparel at decent prices. www.swim2000.com.
4. Speedo Tip of the Week - Weekley article on the USA Swimming Web Site. http://www.usaswimming.org/USASWeb/DesktopDefault.aspx?TabId=144&Alias=Rainbow&Lang=en