Simply call the local number using any phone (there's one for every state) and select the destination you wish to call. Calls will be routed through Skype's system at Skype's normal rate. No computer or Internet access needed.
Skype to Go used to be a product that only Skype Pro subscriptions had access to but they have recently opened access to all paying (those who have used SkypeOut to call numbers) users of Skype. Go into your account setup and they will tell you (via SMS and website) the local number to call.
Useful service for those who get free local calls or those at work.
Skype's rates in AUD,
2.7¢/min to most of the world (US,UK,NZ,AUD etc.)
26.4¢/min to Australian mobile phones
More rates.
Nice. I was looking at it the other day and the unlimited local call option (~AUD$7.85/month) looks good if you does quite a lot of local calls (> 100 if you use 8c/call from PennyTel).