I use the Easydiscuss & Easyblog. I like easydicuss extension very much, cause this is the new generation of Forums. Not a doll, complicated one... just plain, simply and very attractive to the eyes. Also it has a ton of awesome features, so you can customize it really easy to your needs. And please know that i am a noob regarding devellopment, but with products of Stackideas its a piece of cake to give your website a proffesional look with just a few clicks.
Love the products and will ALWAYS keep supporting them!