Check this out - you can now get google maps really easily on your blackberry (at least, it works on my 7510).
http://www.mgmaps.com/index.php
It's a program that pulls the maps right off google's website, but gives you an interface to control the maps (searches, bookmarks, etc) that's much better on the blackberry than just going to the website.
I installed it earlier and while it seems cool, it's very slow in downloading the maps.
I also had a problem installing the program using the wapsite as mentioned in their download page. I had to email myself the manual download link, and it worked like a charm from there. Here's the link:
http://wap.mgmaps.com/mgmaps.jar
And no, I'm in no way at all affiliated with this program or company or anything. I happened to see this program on a cell phone site tonight and thought it seemed like a great idea.
- CK