Slacker are working on version 3.0 of their awesome streaming music app and Jessica at CNET got a preview of what we can expect. Version 3.0 will give users the ability to sync cached songs OTA, with a data or WiFi connection. Apparently the syncing process is a little slow unless you’re using WiFi but the feature is still a much wanted addition. The sync feature will only be available to Slacker Radio Plus members, which will run your about $4 per month. Expect Slacker 3.0 to hit App World in a few weeks.