Over the last couple of years I've come to rely on free tools from Google to assist with functionality on my Drupal powered websites. At first I just used Google's site search tool. Since then it seems that every couple of months Google has either released (or acquired) tools that can enhance your Drupal site.

Here is a list of the Google tools that I've used in conjunction with my various Drupal-powered websites.

• Custom Search - Allows you to replace the built in search functionality with one powered by Google. Integration with Drupal is simple due to the Google Custom Search Module.
• Site Statistics - Provides detailed visitor statistics for your website. Google Analytics is easily added to your site using the Google Analytics module.
• Feedburner - Allows you to enhance existing site RSS feeds, including statistics and the addition of enclosures for podcasts. The FeedBurner module (Drupal 5 only) makes integration simple. Alternatively you can manually adjust theme files to point to the new FeedBurner feed.
• Documents - You can't use Google to have your users upload documents. But you can embed presentations into pages on your Drupal site. You can have visitors submit information to spreadsheets via embeddable forms. You can even post documents to your blog via XML-RPC.
• Adsense - Those who are inclined to earn some money from their Drupal site can integrate Google Adsense. Adding to the site can be as simple as cutting and pasting code into a block. Site builders can get more control over Adsense by using the Adsense module.

All of the tools mentioned above are free. The custom search feature does include Google Adsense links in the search results. And some developers have concerns about sharing their site activity with a giant technology company. If you can stand sharing your data (I know I can) then some or all of the tools Google provides can be used to enhance the experience on your Drupal site.