Kent

Darren has an excellent post for virtual workers of all stripes. As my current "job" starts around 7am, and often ends around 11:40, I'm finding I need to relearn how to stop working. The danger in working from home is the inability (for me, at least) to step away from the desk. What I've been experimenting with lately seems to have helped a bit, so in addition to his excellent suggestions, I'll add a few of my own:

• If you're really busy, shut off IM (and probably also your e-mail client). Having your IM up, even marked as "busy" seems to just be an invite to people. Similarly, if you use Outlook, shut off the popup notification. You don't need to know the instant an e-mail comes in, it should be able to wait a while (previous manager's management style notwithstanding).
• Don't eat crap. With a kitchen nearby, and probably the usual junk or mostly junk food in the pantry, there's a lot of temptation to snack throughout the day, or eat something dreadful for lunch. (This last point I'm really bad with, as I'm more than willing to eat ramen three times a week for lunch.)
• Use online tools. I've been switching my email and calendaring from Outlook to assorted Web-based tools. Not because I think they work better (although the startup time is nicer), but because I flit between three computers (and a couple of VMs) throughout the day, and that means I've missed appointments and other events that have popped up "on my Outlook machine upstairs".
• 100% in agreement with Darren's "get out" rule, but I'd also add "interact". Join a User Group or other association where you can talk with like-minded folk and interchange ideas. You never know, it could even mean more work.
• Keep your coworkers informed. One of the big worries that companies have when they have employees out of the office is that they aren't really working all the time. Keep a log/timesheet/wiki/whatever so that they know what you're working on, and relative progress. Nothing too detailed, or you'll likely not use it. I've been using SlimTimer lately, and it seems to fit nicely with my workstyle. I keep it up in a browser sidebar, and switch between tasks throughout the day, adding comments for specific projects. When invoicing day rolls around, I can produce a quick report that reminds me, and shows others, just what I've done. Similarly, a Sharepoint site helps me share files with others (I know of others who use Backpack for the same purposes).