I can't believe I only just found this group. In case you didn't get it through Planet Drupal, at CivicActions I have been working hard on the Witness Hub Map. It is a mashup of google maps with the Hub with enhancements that make it appealing, interactive, fun and (almost) infinitely scalable.
Currently you can see the map has a large amount of markers on it and it has a full-screen mode and switcher. I've just implemented a delayed marker loader that loads 4 markers per 1 second (or other rate) which keeps the map usable and responsive while loading 100s or 1000s of markers.
We have more exciting developments in the works and I plan to contribute the code in the near future. I may also be presenting this at DrupalCon.
I'd be interested in feedback and the best way to contribute this.

Partially sponsored by CivicActions and Witness.

Comments
Fantastic!
This is an amazing project - I'm really interested to learn more about how you developed it. The full screen mode and delayed marker loader are both excellent features.
I read on your page on DrupalCon that you're contributing it to the GMap module - could you add an update here when you've done that?
Cheers!
http://www.thomasturnbull.com
http://twitter.com/thomasturnbull
Sure. I don't think that
Sure. I don't think that session proposal got into DrupalCon, so it's not a priority for me now, but it is something I still plan to do.
Bevan/
Bevan/
Full screen mode
The full screen display is fantastic - please make this available soon.
Mark
I'm working on this with
I'm working on this with Bevan to contribute it as a module/addon. I'll update here with progress...
http://www.thomasturnbull.com
http://twitter.com/thomasturnbull
Excellent
Love it! The delayed loading really makes sense.
Meg Lee Chin
http://megleechin.com
Meg Lee Chin
http://megleechin.com
Exactly what I currently
Exactly what I currently need! Any progress?
interesting
This is great stuff. I'd be interested in finding out if there's generic module being developed for dynamically updating maps with different types of data, overlays, etc. live feeds for updating rss feeds
And this map for Witness - At Causecact we are also working with them. They are a fantastic organization. We are helping them raise donations via our website for free. Can I somehow embed their map onto their profile on Causecast? http://www.causecast.org/org/witness I'm sure they'd dig it.
Ryan Scott
CEO, Causecast.org
We are hiring LA based drupal wizards!
Ryan Scott
CEO, Causecast.org
We are hiring LA based drupal wizards!
I'm interested in ALL about
I'm interested in ALL about google maps api and drupal but the link isn't functioning http://hub.witness.org/map#full-screen?
Full screen
Works for me in Chrome. Perhaps it's a browser js issue? Are you getting any js errors?
http://www.thomasturnbull.com
http://twitter.com/thomasturnbull
No errors and it's only in
No errors and it's only in Firefox that it's not functioning. Explorer and Chrome is OK.
Did this never been made for drupal or are you still working on it or?
Nice to meet you face to face on DrupalCon in Copenhagen. :-)
How to add fullscreen mode and street view mode in gmap?
How to add fullscreen mode and street view mode in gmap?