I just realised a massively useful tool for Linux users: Utilise the Compiz zoom feature when tracing from low-resolution Yahoo maps.

I think it's super+scroll will zoom in and out of the desktop, and it makes it far easier to get a good grip on a difficult terrain. I think there's a comparable feature in Windows & Mac, so give it a try some time if you haven't already.

Edit: Also just added a number of streets in Narangba, QLD, Australia. I'm planning on visiting and GPS-ing a few of them tomorrow as the geo data seems to be a bit inaccurate.