I agree with Sam on the Dr. Geep tutorials. Excellent and to-the-point! Here's some more space and time-savers:

When you're doing all that saving, you need not save everything as a Poser file. As Sam said, save Everything, or as much possible, in the Libraries. Takes up Much less space than a PZ3 file. The PZ3 files you do save, off-load them to a CD as soon as possible so they're not clogging your hard drive. Same way with all those lovely renderings you're doing. It's amazing how small a 20-Gig HD is once you start loading it up with graphics!

And finally, one thing I do personally, is alot of my scenes are inside rooms, so Using the Room Creator over at Daz, I've built several basics and saved them as PZ3 files. that way, all I have to do is create my characters, save them to the library, open the room I want and import them. Saves OODLES of time!