If you want to market an affiliate product through SEO, you can monitor top 20 results for a search on that product. You will know if and when your site breaks into top 20 results, and can watch it as it hopefully continues climbing to that first position.

There are other uses as well. SEO firms can monitor clients' results. Niche marketers can easily monitor both industry news and niche search results. You can even monitor search results for your best keywords and your own high ranking pages.

Google Alerts, though free, can provide valuable marketing intelligence to online entrepreneurs who take advantage of it.

Use of Google SMS service is free at present, though of course users will need to pay any connection and messaging charges from their wireless carriers.

Google SMS can be handy for travel in particular. For example, let's say you've arrived at your hotel, and really have a taste for Chinese food. You may be able to use Google SMS to enter "Chinese food delivery" followed by zip code of your hotel. Google will return, usually in less than a minute, a list of local Chinese restaurants that offer delivery. This is a nice alternative to looking in a phone book, where you may not know city, and also is handy for situations where you may not be able to connect to Internet easily.