I am working on the import of the Planimetria of Vitoria, a high resolution data set with multiple layers. Thanks to h4ck3rm1k3 I have now a perl filter/chunker, and I have made a chuck-fixer in case a node is missing from one chunk.

Mike's filter is designed so that it can take a list of layer names, and chunk up all ways and poligons containing those layers, that way I can make separate chunks for cycleways, or unclude both unpaved and paved ways in the same layer.
I have also substracted a layer list.

To help me in the tagging, I made a separate preset file for my JOSM, where I have an dedicated button for adding the source=Planimetria de Vitoria tag, that all the imported data will contain.

Ruff estimate says I might have done all roads, footways, cycleways and paths within wednesday morning, which sort of is my deadline, I will also see if I can made a hotel layer, chuch layer and school layer before that, but the way layer have priority.

I found one possible problem though, it seems there is a slight offset between my data and that which is already in based on GPS tracks. I will check if this is a fixed offset, in that case I will align the entire changeset accordingly before upload, if not, than I will need to investigate a bit in how to solve this.