[As tested on my Motorola V551 (with latest firmware)]

v1.4.4 of Google Maps for Mobile <http://www.google.com/gmm>

Significantly more stable than recent prior versions -- hasn't yet
crashed, and hasn't yet lost history data, but still loses bookmarks
unpredictably, so it's still not fully stable. Worth the upgrade, and
very useful even with the bookmark issue, but still a work in progress.

v1.1.0 of Google Mail for Mobile <http://google.com/mobile/gmail>

Substantially more stable that v1.0.0 (which crashed frequently) --
hasn't yet crashed, and does an excellent job of handling email.
Excellent application. Highly recommended.

v3.0.0 of Opera Mini <http://mini.opera.com>

Significant update that retains look and feel of prior version.
Wouldn't install if I preserved by existing bookmark data, so I had to
start over -- may not be worth the update if you've got a lot of
bookmarks. Excellent application. Highly recommended.

--
Best regards, FAQ FOR CINGULAR WIRELESS:
John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>