I have been doing development on SQL Server Integration Services (SSIS) 2012 for a few months and I have quite a lot of experiences to share on this blog. Sharing them will happen over time but I do want to begin with this particular nugget.
Very simply, put this post-it note on your monitor.

You’ll be glad you did. Trust me!
Alternatively you could just download my SSIS Reporting Pack ;)

UPDATE: I should also point out that the built-in reports do provide the same information:

You will still find the post-it note invaluable though!
@Jamiet
P.S. Some background: catalog.executions (SSISDB Database)