Google has quietly rolled out a series of small but useful enhancements to Search:

Instant Preview now supports Flash for MOST previews.
If you have Quick Scroll installed (either as a Chrome extension or as part of Google Toolbar) you can click on a highlighted area within an Instant Preview to go directly to that section of the page.
Instant Previews can now be used on mobile devices, Android tablets, iPads and the Opera browser.
Previews support additional result types, including .doc and .ppt files; and video results now have a playable interface.
“Dictionary” has been added to the left-panel. It’ll serve up definitions, examples of the word in context from news, related phrases, synonyms and more. One click on the translation tool then brings you to Google Translate.

Good stuff.