If you too cant stand the new YahooMail layout...
This has been bugging me since it was changed over. The 'Classic' view is much easier on the eye IMO and I discovered this trick to switch it back...
"NEW YAHOO! MAIL IS STILL UNSTABLE....IT WOULD BE BEST TO GO BACK TO YOUR PREVIOUS VERSION OF YAHOO! MAIL...
To go back to YAHOO! MAIL CLASSIC...
For IE: Open TOOLS > INTERNET OPTIONS >> SECURITY. In security click "CUSTOM LEVEL" -> disable active scripting in the scripting section.
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Or just switch to Gmail which is hands down the best one out there.