I bought a new Nokia E70 recently, and of course, iSync doesn't support it yet, so I did a little hacking and got it working. You can read all the details, including info on fixing a timezone offset issue, in this entry on my blog. Read on for the required edits to MetaClasses.plist.
In the Finder, control-click on the iSync application and choose Show Package Contents. Then navigate into Contents -> Plugins -> ApplePhoneConduit.syncdevice -> Contents -> Plugins -> PhoneModelsSync.phoneplugin -> Contents -> Resources. In that folder, modify MetaClasses.plist (make a backup first!) using the below code.
<key>com.nokia.E70</key>
<dict>
<key>Identification</key>
<dict>
<key>com.apple.cgmi+cgmm</key>
<string>Nokia+Nokia E70-1</string>
<key>com.apple.gmi+gmm</key>
<string>Nokia+Nokia E70-1</string>
</dict>
<key>InheritsFrom</key>
<array>
<string>family.com.nokia.serie60v2.3</string>
</array>
<key>Services</key>
<array>
<dict>
<key>ServiceName</key>
<string>com.apple.model</string>
<key>ServiceProperties</key>
<dict>
<key>ModelIcon</key>
<string>NOKE70.tiff</string>
<key>ModelName</key>
<string>E70</string>
</dict>
</dict>
</array>
</dict>
Save the file, and you should be set. More details on my above-referenced blog entry...
Mac OS X Hints
http://hints.macworld.com/article.php?story=20060609072857488