MintFly.com is the first iPhone client for Salesforce.  Access native functionality throughout Salesforce including search, edit, related lists, and much, much more.  With plans ranging from a free limited edition to a Pro full-featured edition, there is an option for everyone

Being a hosted service like salesforce.com itself means there is nothing for you to install. Navigate to http://MintFly.com using your iPhone and you will automatically be presented with our Salesforce-iPhone interface. Start using the Free edition and upgrade to Pro at any time all from the comfort of your iPhone.