We're very excited to announce the general availability of an iPhone version of VinCellar. This is an iPhone-optimized web site and we've worked very hard to incorporate all the most important features that you've requested.
Here is a brief tour of what you can do on the go: 
Search and browse wine within the community and your cellar
Search for tasting notes
Add tasting notes (and update Twitter if you have it linked to your VinCellar account)
Add wine to your cellar
Consume wine
View public profiles of other users
Due to the space constraints of an iPhone screen we've had to analyze the layout of each page to expose only essential data and features. On the technical side we've also looked closely at performance and have optimized network access for mobile networks. The result is that the site should be accessible and responsive no matter where you are.
How to start using the site now
You can access the new version of the site using your iPhone by going to the regular VinCellar URL: http://vincellar.vinfolio.com
You can find more details and add your feedback in the following forum post.