My group this past Friday started a new campaign, hosted by yours truly. The previous DM and his wife (also a member of the group) just had a child, so a lot of his time and energy is going towards their new daughter.
To say I was nervous about DM-ing would be a bit of an understatement. When it comes to the rules, I am not the most well-versed person around. But I can tell a story, and the rules will sort themselves out. Besides, there’s more than enough people who do know what they are about.
System used is Pathfinder, also known as D&D 3.75. It’s a modification of D&D 3.5, and preferred by our group above D&D. It streamlines things somewhat. Setting used is the Pathfinder-world Golarion. We’re playing The Shattered Star-adventurepath, but haven’t got very far yet.