Another option is "Sparse Tile Layer Overlays"

Dynamic map version

    www.polyarc.us/sparse

Static map version

    www.polyarc.us/poly

To keep it legal, you will have to replace Google's "mapsdt" server
with your own tile server.

Tiles have an advantage over GPolys.  Tiles are cacheable both locally
by the browser & globally by the tile server.  GPolys have to be
reconstructed from scratch by every user during every session.

Generally, tiles are not "clickable" but it can be done.  Look at:

    www.polyarc.us/polybuilder

It does "rollovers" too.  GPolys are quite sluggish at both.

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