Here are the collection of snippets to do CRUD operation with ZKSforce (Force.com toolkit for iOS).
Remember this is a SOAP based API, there is a new alternative library available from salesforce called MobileSDK for iOS.
Not many of my ideas are converted to a project, this one has seen its light last week. Though I haven’t completed all the UI and features of my original vision, it is better to have one working idea than nothing.