There are some useful websites for all areas of home improvement out there:
The Repair Clinic
Here you can shop for appliance parts, lawn mower parts, vacuum cleaner parts, and over 115 other brand parts. They promise fast, guaranteed delivery.
The most complete database of replacement light bulbs on the Internet. You can search an inventory of 240,000 bulbs for your particular application.
Green Home Makeover videos are presented by National Geographic and thegreenguide.com. There are interesting and simple informative videos about the steps homeowners can take to make their home healthy and eco-friendly.
Another great site is Yelp, which features customer reviews and ratings on every imaginable local businesses.