I have posted 2 examples of triggering a resize event.
 
http://www.lawless.info/gmaps/resize.html
 
The first one simply has a button to resize the map and StreetView is not enabled.  This works fine.
 
http://www.lawless.info/gmaps/resize_StreetView.html
 
The second example differs only in that the map has “streetViewControl: true“ set in the options.  Without even looking at StreetView resizing the map causes the following error in Firefox (ok in IE7, Chrome, Safari, Opera)
 
Error: e is null
Source File: http://maps.gstatic.com/intl/en_gb/mapfiles/api-3/2/1/main.js
Line: 67
 
This code, which was built into my application development, was working on Sunday 16th August.

The problem is associated with the controls being too large to fit in the new 200x200 map div.  If I change the controls to 'small' and 'dropdown_menu' the problem goes away.  Dynamically resetting the controls as part of the resize restores the problem.