Here is how you can add support for your Motorola A1000 phone to Tiger. The procedure is much simpler than the one in Panther, as iSync has been completely rewritten (or at least, much of it has) and it's now much more stable and organized. You simply have to change this file:
/Applications: iSync.app: Contents: PlugIns: ApplePhoneConduit.syncdevice: Contents: PlugIns: PhoneModelsSync.phoneplugin: Contents: Resources: MetaClasses.plist.
Add this entry to the file -- add it all just before this line:
<key>com.sony-ericsson.P910</key>
To open the file, use this command from Terminal:
sudo open -a TextEdit /Applications/iSync.app/Contents/PlugIns/
ApplePhoneConduit.syncdevice/Contents/PlugIns/
PhoneModelsSync.phoneplugin/Contents/Resources/MetaClasses.plist
Modify the file, and be sure that TextEdit is saving the file as Plain Text (in its Preferences), and save it (keep a copy of the original just in case). At this point, simply redo the pairing, and it'll work just fine (iSync will first install an iSync agent onto your phone).
Enjoy!

