Below is a list of all the Google Mobile sites I have found. You can copy and paste these URL's into your bookmark manager and save them for later use when you need them while using 3G data.
Please note that this list may get updated from time to time to include the right links. If one isn't working for you; leave me a comment on this post and I'll try to find one that works.
Here is the full list I have so far:
Google Places (Also known as Google Maps)
If you know of more Google mobile sites or any others that will work on the Chrome browser on Chrome OS and other operating systems. Leave them in the comments below.
Here are some extra mobile sites you can use vs. the full desktop versions:
The Weather Channel