Puzzlebomb is a monthly puzzle compendium. Issue 4 of Puzzlebomb, for April 2012, can be found here:

Puzzlebomb – Issue 4 – April 2012

The solutions to Issue 4 can be found here:

Puzzlebomb – Issue 4 – April 2012 – Solutions

Previous issues of Puzzlebomb, and their solutions, can be found here.

(The April Fools’ version, in case you missed it, can be found here.)