Google doesn't use TITLE tag text to evaluate ranking.
Using this board as an example:
Quote:
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<a href="showthread.php?goto=newpost&t=34437" title="Go to first unread post in thread 'CCBill links with encoded '&' don't work'">
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site:http://www.greenguysboard.com "Go to first unread post"
returns no results.
At least until this post gets indexed.
Quote:
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<img class="inlineimg" src="mimg/buttons/lastpost.gif" alt="Go to last post" border="0" />
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ALT Text?
site:http://www.greenguysboard.com "Go to last post"
If you look at the cache:
Quote:
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These terms only appear in links pointing to this page: go to last post
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ALT text is still worth using imo as part of Google Images optimization, but not for regular SERP if you're targeting competitive keywords. After all, we're talking about an on-page element that visitors on some browsers don't even see.