The Missouri Grassroots Ron Paul 2012 campaign used my voice extensively in a number of campaign event notifications.
I've provided narration for short-form documentaries, narrated children's books, and done commercial voiceovers for radio.
I worked in radio, however I am a strong advocate of unique intonation and rhythm. I do not enjoy the smooth and polished sound of the typical voice professional. Unfortunately, they have a tendency to all sound the same. I much prefer recognizable "film star" voices for this reason...and it's why I try to be different in my own interpretations of the spoken word.
I generally speak into a Heil PR40 routed through an MBOX II Mini connected to my Mac. For polish and shine I use various software effects contained in both Final Cut Pro X and Audacity. I also own a number of other microphones from a Sennheiser wireless lav to a Sennheiser shotgun mic.
If reliability is important, then I get high marks.