So, you really want t go for that title, Zas? i can tell you, it can be pretty tedious and annoying, especially towards the end... I am at 99.8% for Cantha, now.

I got from about 99 to 99.7% by taking screenshots off my minimap and comparing the edges to a 100% map off the Wiki, then go over there for some more wall-hugging. After that, I had no idea where else to look for the remainder - except a few small areas on the Kurzick side of Aspenwood and Jade Quarry. I am currently checking 3 different GW forums to see when a party forms to map there.

The 0.1% from 99.7 to 99.8 I got by accident when I tried to collect some celestial essences for the New Year's dish - it turns out there was a small area right in the middle where I hadn't been before...
:wbash


EDIT: You may also find this useful, if you haven't seen it already. That 'end of the world' area behind Eredon's is pretty freaky, even if you're not going for the title.

:fool