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Q: Can I show different content in the preview?
A: No. You must show Googlebot and the Google Web Preview the same content that users from that region would see (see our Help Center article on cloaking).
This is google stuff. Google Toolbar feature. Called either Quick Scroll or Best Match.
[edited by: tedster at 6:36 pm (utc) on Nov 26, 2010]
[edit reason] Change formating [/edit]
No snippet meta tag
The no snippet meta tag is a tag designed to keep Google from using page text in the SERPs, beneath your title tag. The use of the no-snippet meta will remove the instant preview. If currently using the no-snippet tag, is it time to consider removing it in order to test the benefit of displaying an instant preview?
Do you see any site's icons?
Alternatively, if you do see others' previews, do you use "x-robots-tag" elements in .htaccess, and/or use page-based meta tags?