A few new/revised ideas on getting more out of your writing time:
I know how much I harp on quota, but don't count or think about the number of words, pages or scenes you're getting down while you're in the process of writing. This can be as detrimental to your progress as backtracking and rewriting. Forget all about the numbers and simply write straight through your allotted writing time. You can get out your calculator and kick yourself (or pat yourself on the back) when you're done for the day.
Try using footnotes or comments as block tags. I've mentioned that when I can't find the words to describe something (usually setting), I tag it in the manuscript like this: [describe Central Park in mid-winter] and move on. Later I would do a search for the  brackets and fill in what I didn't write. Recently I've instead tried using MS Word footnotes or highlighted comments to perform the same task. It seems to works better and faster for me than my old method, and I never miss a tag now.
Some potentially useful freeware* to make the most of your lunch hour at work (if your boss is okay with you using the company computer for personal stuff, naturally): Portable Scribus freeware is "a portable version of an open source page maker called Scribus, which is much like Adobe Pagemaker, which can help create professional looking documents, newsletters, magazines, etc. With Portable Scribus, you can put it on your USB drive, and plug it in to any computer, and leave not trace behind when you're done."
(A sidebar on Scribus: Author Jacques Centelles used Scribus to put together his lovely, photo-rich book on marine life, which you can read about it on the Scribus site here; there are also some notes on the site about another French author who actually published a book made with Scribus.)
Work out a scene timeline in your head or on paper before you write the actual scene. This is simply a way of sketching out the main events of a scene in sequence and in advance of the writing (organic writers may ignore this if it crowds them too much.) Example:
John takes Marcia home from Halloween party.
Marcia produces stolen, mystical diamond.
John informs Marcia that he is a cop.
Marcia attempts to run into her house.
John uses his half-demon powers to stop her.
Marcia gives John the diamond and insists it was planted on her.
John has precog vision and pulls Marcia into his arms.
Marcia's house explodes.
Finally, an interesting setting trick passed along from one of my high school students that can help those of us who struggle with fleshing out settings: you can furnish your character's house by cutting out bedroom, living room and diningroom sets from sale circulars in the Sunday paper or from furniture catalogs and taping them to pages in your novel notebook (historical writers may want to use images of period furniture taken off the internet.) If you don't like what's advertised, go to furniture stores and take photos of what you do like. If there's some element in the picture that you want to add or change, draw it in or tape in a replacement item. If you really want to get detailed, add paint, counter, rug and/or flooring chips from a home improvement store for each room. Now, how does all this save time? Before you write a scene in that room, look at the room pages in your notebook to refresh your memory about exactly how you planned it to look.
What have you found or invented recently that's helped you with your writing productivity? Let us know in comments.
*Freeware caution: always scan free downloads of anything for bugs and other threats before dumping the programs into your hard drive.