Below are plugins I recommend for WordPress
Members highly recommended for collaboration.
NextGen Gallary for simple photo management. Can be used to rotate through images. I use it to highlight VIP sponsors.
iFrame. WordPress doesn’t allow iFrames for security reasons. This plugin supports iFrames which are necessary for embedding things such as a Google Form or PayPal buttons.
AWPCP for Classified Ads
Exclude Pages From Navigation. I found this plugin searching how to remove pages that showed up in the Classifieds Menu created by the AWPCP plugin. Previously, I had made pages private to keep them from showing up in the menu which is related to the theme I am using. Now with this plugin I have better control of whether a page should be on a menu or not.