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The only time Google uses your meta description tag is when you have no text at all on your page. (and no text on your page, means no rank in Google at all (99% of the time...)
What you are seeing used as your description in Google is what everyone on these boards affectionately call a "ransom note" description, which is a random sampling of text taken from your site which is relevant to the keyword search you are performing.
It's a mystery how they come up with it, but it can be bad, as you mentioned, with the copyright, contact info or date modified coming up, or it can accidentally come out like ad copy. One is now reading
"important keyphrase anotherword $9.99. WOW!..."
The important two word phrase happens to be in an alt tag in about the middle of the page with the others regular text right after it.
1. If blue widgets appears within the first ~140 characters of the web page, the snippet will display blue widgets and all preceding text.
2. If blue widgets appears again within ~70 characters of the previous blue widgets, the snippet will be a continuous: i.e. no .... I think for snippets, Google gives priority to the phrase blue widgets before the individual search terms blue or widgets.
[edited by: Marcia at 8:47 pm (utc) on Oct. 11, 2002]
[edit reason] formatting problem [/edit]