Remote control, tripod. The ratio of good pics is about 5X better than when I was using a timer, plus I'm not constantly scurrying back and forth. Like Marina I also try to put a mirror near the tripod, and sometimes I will plug the output of the camera into the input of a TV so that I can see what the onscreen image will look like.
It's a bit of a pain, but a lot less aggravating than discarding 98% of my photos. (Now I discard about 90% LOL).
Warning to people thinking of buying a camera with a remote: most remotes for digitals only control playback. There are only a couple models that have a remote shutter release. Check the specs carefully!
Erica