I wrote a small Java ME application for the LG CU500 that can import contacts from a gmail.csv file that is transferred to the phone. By default it looks on the root of the miniSD card. You can change this (although it doesn't save this configuration after you close the application).

http://contactimporter.sourceforge.net/

You will also need to modify your java permissions as noted in this thread as this is not a signed application.

Please feel free to comment on this below.