I recommend against hiding, that's a tricky technique that can burn you. You very much want the text to be on the page. Thus the simple approach has some merit:
<img id="mybloglogo" src="myblog.jpg" alt="[My blog about great stuff]">
However, there is no perfect answer. See Replacing H1 text with a logo image: best method for SEO and accessibility? and google for this topic to understand the passion behind various views of this issue.
If you don't want to spend hours researching, you have a simpler option. View your page. Now disable CSS and look again. Now disable images and look again. If the page reads and works fine at each stage, you've got it covered for readers both human and robotic.
To turn off CSS in Firefix "View->Page Style->No Style"
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` title and/or the `
– Jan 11 '12 at 18:02` description using the tutorial mentioned above. Assuming you'd like to have a logo shown instead I'd make sure it contains both an `alt` tag (search engines if I'm correct) and a `title` tag (screen readers, again if I'm correct)