I was working on SharePoint 2010 Excel Services, where you can see in the Office Excel 2010, publish option to sharepoint is moved to "Save & Send" option, which comes under File, which is different from Office 2007.
But, If you go to that location,you will see Save to SharePoint option, but you will not see browse option to save that excel work sheet in to SharePoint Library.
This is because, your office installation is not uptodate. you may have to upgrade your Office Professional Plus 2010.
check this for upgrading details.
http://support.microsoft.com/kb/983473/en-us?p=1
