Hi all,
Just a brief intro before I start: I'm Scott Savage, and I'm a Senior UX Designer with Monster.com on the Government Solutions side. I, and my other UX counterpart, are on the Product Management team, and we're currently using Mockflow for our low-fi prototypes/wireframes, and manually constructing hi-fi versions in either Photoshop, Dreamweaver, and occasionally delivering fully interactive prototypes in HTML/CSS/Javascript.