Just found this site and think it is very interesting. I had a go with the topo editor (added a line to Cheesewring Quarry). Pretty easy to use once it has loaded.
Also edited the Shorn Cliff sketch map although I found this not quite as intuitive to use but managed to do what I wanted after a bit of playing about.
Will be adding more in the near future!
Pete.

Thanks Jalfrezi, Hope to hear from you again soon- BTW, can you pinpoint any specific issues you had with the sketh map editor?

I just added some details from California and I was not able to get the editing tools to work on the topo editor. The edit line tool stayed selected (outlined in red) the whole time but when dragged over the newly added routes while in edit mode it did nothing. No other tool would select. In edit mode or not the cursor just showed a regular cursor arrow over all windows in the java field.
On the other hand the Map Editor was just fine, appropriately simple to just give an overview map with easy use of tools to append text and such.