Google Suggest
There is no shortage of cool search tools from Google these days. My most recent favorite was Google Scholar. However, I just played with their newest tool, Google Suggest. In addition to making searching easier, it is an excellent tool for designers working on keywording web pages. You can easily get an idea of related search terms (including common misspellings) while you type.
Ps. If Google Suggest peaks your interest and you want to know more than just related keywords, check out snap.com.