http://www.beginnertriathlete.com – a treasure of a website and great forums!
http://www.trisports.com -my go to for equipment
http://www.amazon.com – has lots of products, often cheaper.
http://www.teamestrogen.com – women’s tri products
http://www.active.com – some great reading
http://www.pinterest.com (you didn’t think I’d make it a whole page without mentioning this, did you? Oh, you did? Haha)
http://www.usatriathlon.com -USAT website $45 annual membership (rather than $12 per race day) and you get great discounts.
http://www.twitter.com – log on and join the conversations! “Meet” other athletes!