Celebration, undoubtedly. Potlatch is by far my favourite editor, and just keeps getting better.

You can have a look at http://www.gravitystorm.co.uk/osm/ and http://www.gravitystorm.co.uk/shine/archives/category/openstreetmap/ to see how to combine cycling and OpenStreetMap!

Nice unit! Make sure you try putting OSM maps onto it - it makes the garmins twice as useful!

osm.wiki/index.php/OSM_Map_On_Garmin

Looking forward to seeing that appear.

Well done! Make sure you add this to osm.wiki/index.php/OpenStreetMap_in_the_press

It's been on my todo list for quite a while now - I'll get there eventually!

Being able to track changes and maintain your area more easily is something that a lot of people want to do, but it's not very easy to do so at the moment. It's being worked apon - we need to make some changes to OSM to make this easier (like change sets and more 'wiki features').

Sustrans are renumbering some of the routes - the wandle trail through to Croydon is being renumbered to 20 when it gets signed hopefully in the next year.

As for completeness, I find Sustrans are, umm, "ambitious" in what they think are cycle routes using their maps, so it's often impossible to tell.

Nice one.