Please check back after sometime, I will keep this list up-to-date with all the interesting plugins I come across.
For a complete list of plugins available in IntelliJ IDEA, please check this link. As of today, there are 865 plugins available for IntelliJ IDEA Ultimate Edition and 819 for IntelliJ IDEA Community Edition.
Update on 05th April, 2015: After a fair bit of time here, I have moved on to GitHub hosted Octopress blogs. Please find me on http://P7h.org henceforth for all new updates.