The client asked me to come up with SharePoint 2010 layout improvement. That layout has been migrated from SharePoint 2007.
What are the things i need to concentrate to look the layout that fit with 2010.
I think it will be good to understand "Major functional areas of a SharePoint interface" before working on layout ,So for that please take a look for the below article it may help you
Real World Branding with SharePoint 2010 Publishing Sites
Real World Branding with SharePoint Server 2007 Publishing Sites (Part 1 of 2)
Real World Branding with SharePoint Server 2007 Publishing Sites (Part 2 of 2)