Stumbled upon this post when trying to use the ULS logger to see an error:

http://www.habaneroconsulting.com/insights/An-Even-Better-Way-to-Get-the-Real-SharePoint-Error#.UvVtBPldV8E

See the blog above for full details but here is a simplified way to get an error:

1. Get correlation id from window

2. in PowerShell (run the following commands):

Merge-SPLogFile -Path “.\error[x].log” -Correlation “85ea729c-071c-d0b1-d6c7-065c6284a50f”

Dir *.log

I name my log errorx where x is a number and delete them after I I’m done.

Saves to C:\Users\ [your user name]

3. Open ULS Viewer > Open File and select error[x].log

Way easier than hunting through ULS logs.