Ok, so I decided to do some looking. The iPhone version of Latitude is run thorough a webpage, so I thought I might give the same a go.

Seems to work.

Install the maemo-geolocation plugin for the browser;

In the browser open "http://www.google.co.uk/maps/m?view=...urce=mog&gl=uk" which is the page the iPhone opens. There doesn't seem to be a check on the useragent (except if you try to open google.co.uk directly).

I guess it will be something similar for people not in the UK, a combination of desktop Firefox + "User Agent Switcher" + tcpdump should tell you exactly if you can't work it out by guessing.

Then click away and use the (web)app.

Location updates seem to work automatically.

I've not done much testing, but am ever hopeful this will give us access to a shared location service (as Latitude is sort of a de-facto standard now as it's supported by so many phones).

The one thing I have noticed is that it doesn't change the "last updated" time for a user, this is changed, iirc, if you use the Google homepage Latitude applet, so there's presumably some way of doing it.

Let me know if it does or doesn't work for you.