Supposedly, in the past, entering in the longitude followed by a comma and followed by the latitude, it would return the location on Google Maps. Now, it shouldn't work - but honestly, it currently does for me (maybe, I am on a different data center). The way to get it to work, is to prefix the longitude and latitude with loc: (for example, enter in loc:37.425866,-122.085743).
This works for me on both my iPhone and Safari browser, so maybe it is Blackberry specific? I am not sure.
Google's Tom from the Google Mobile Maps team said:
I've checked with a few teammates, and they've informed me that we've made slight adjustments to our search algorithm: In order to pinpoint a location on a map, please use the prefix "loc:" in the search bar before entering in the lat/long. For example, the search "loc:37.425866,-122.085743" will drop a pin directly on the Googleplex in Mountain View, CA, USA.
Again, this seems to be Google Maps Mobile specific, but maybe not iPhone or Android specific?