I found this simple article in Better Homes and Gardens Magazine. It's 15 websites that will save you precious time. I actually use a few of these or have used them before.
http://www.cozi.com/ Pull together your family schedule and to-do list in one place and share the info via your mobile phone.
www.google.com/voice Consolidate voicemail for your cell, home, and office phones so you don't have to check multiple places. It also transcribes voicemails into text messages.
http://www.penelopeloveslists.com/ The "Assignment" section of this blog has easy five-minute organizing projects you'll be glad you did.
http://www.traxo.com/ Organize all your travel info (itineraries, miles, loyalty points) from multiple sources in one convenient place.
http://www.usps.gov/ Buy stamps online, not in line, and get the design you want.
Home and Garden
www.bhg.com/coloraroom Save time by figuring out the perfect color scheme for your room before you shop for paint or furniture.
www.bhg.com/planagarden Design a garden without breaking a sweat. Drag and drop dozens of trees, flowers, and structures.
http://www.servicemagic.com/ Forget calling around for a contractor. Get matched with a prescreened, background-checked professional online.
Food and Fun
www.bhg.com/recipes Find more than 2,000 quick-fix recipes and save your favorites in one handy spot.
http://www.netflix.com/ Can't wait for the DVD to come in the mail? Stream your must-see movies on your computer or video gaming console.
http://www.opentable.com/ Reserve a table online for your favorite restaurant. (I've used this one and LOVE it).
http://www.thefrontburnerblog.com/ Try this blog's approach to quick cooking: Invest a little planning time up front and eat well all week.
http://www.alice.com/ Instead of wandering the aisles, order your nonperishables (trash bags, toothpaste, etc.) online and get free shipping.
http://www.fatwallet.com/ Save time comparison shopping online. This service does it for you plus looks for the best cash-back deal.
http://www.shopittome.com/ Let this service be your personal shopper, notifying you of sales on your favorite brands at more than 100 retailers.
My Own Fav Sites
http://www.craigslist.com/ I LOVE this site. It's great (and cheap aka Free) to list just about anything. Plus, you can find whatever you are looking for. It's also nice to be able to see pictures instead of just text.
http://www.allrecipes.com/ This site is great. People post their own recipes on this site. I've used it several times. I love that if you are having a dinner party it will let you put in how many servings you need and it will recalculate the recipe for you. It's a huge time saver for holiday's.
http://www.ebay.com/ I am ALL about getting a good deal on things. I buy most of my clothes on eBay and even sell my stuff here too. It prevents you from having to drive to a store or even the mall which is usually crowded.
http://www.petedge.com/ This site is great if you have pets. You can buy just about anything at a discount price and it's shipped directly to your front door.