title or alt?

[Halfdeck]

Google doesn't use TITLE tag text to evaluate ranking.

Using this board as an example:

<a href="showthread.php?goto=newpost&amp;t=34437" title="Go to first unread post in thread 'CCBill links with encoded '&amp;' don't work'">

site:http://www.greenguysboard.com "Go to first unread post"

returns no results.

At least until this post gets indexed.

<img class="inlineimg" src="mimg/buttons/lastpost.gif" alt="Go to last post" border="0" />

ALT Text?

site:http://www.greenguysboard.com "Go to last post"

If you look at the cache:

These terms only appear in links pointing to this page: go to last post

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.