rounded webparts

http://fitandfinish.ironworks.com/2010/02/using-jquery-to-wrap-web-parts-and-achieve-the-unachievable.html

All about breadcrumbs..

http://www.novolocus.com/category/sharepoint/branding/breadcrumbs/

few helpful links

Sharepoint Designer Support team blog: - how to fix errors
http://blogs.msdn.com/spdsupport/