The plug-in is called Tapatalk Forum App.
Also available for BlackBerry and Android phones. More at http://www.tapatalk.com
Go to Apple store with your iPhone or iPad, and search for "Tapatalk forum app"
The software costs 2,39 eur ($2,99). You only have to pay once, it covers all your i-devices.
Install the application and open it. Then search for "leonard cohen forum",
and tap on the name. (Next time it will be ready for you under "search")
Then just log-in with your forum name and password. You will have all
the Forum features available for you, in very convenient format, and MUCH quicker
than it's possible with Safari. It will also show you your unread messages etc.
and you can read your PMs, and so on. Highly recommended!
Also note that you may attach photos to your messages directly from your iPhone!
It also works with 15.000 other Forums.
Tapatalk for iPhone provides full forum access on iPhone including ability to check private messages, upload photos from your camera and ability to search forum, etc. All with super-fast direct forum access at only $2.99.
Tapatalk for iPhone was released on July 2009 with over 30 updates until now. It is currently ranked as Top 10 Social Networking app in Apple app store in United States, England, German, Spain, Sweden, Australia, Canada and in many other countries.