While working with Sharepoint 2010 OOTB webparts, you may need to use some relative paths like when setting your custom XSLT. Then you may think that you can make use of the "~sitecollection" token to be automatically replaced with the real site collection URL. Unfortunately, sometimes webparts can't resolve the "~sitecollection" token leading to an error in your webpart. This article provides a solution for this issue.
Clipping is a handy way to collect important slides you want to go back to later.