iBlueSky (iTunes link) takes things a small step further (and costs a little more at $7.99USD). While the basic interface is the same, there are multiple benefits to this one. First, it adds landscape mode, which is an improvement for both editing and viewing. For some reason, I especially appreciate one minute detail: it only takes a single tap to select a node. I'm not completely sure why that makes me happier, but it does. The real leap forward for iBlueSky, however, is the clipboard menu. It allows for cutting, copying and pasting branches of the map, making reorganizing possible. The last option on the menu is the kicker; "Email Project" sends an email to the selected recipient with the project attached in PNG, PDF, OPML and Freemind MM formats. While MindMaker is supposed to have an export function in the upcoming update, this feature makes iBlueSky -- for the time being -- infinitely more useful.
My biggest complaint with both apps is that neither automatically adjusts the position of nodes, requiring constant manual untangling of branches as new nodes are added. A balancing feature which spreads out the nodes would be greatly appreciated. At this point, I'm much happier working on my MacBook Pro and making use of all of the advanced features found in the (inherently more robust) desktop mind mapping applications. But I've got iBlueSky on my iPhone, just in case my mind mapping addiction takes hold of my psyche and the laptop is out of the question.
It should be noted that the web-based MindMeister provides a small web app version of its "geistesblitz" widget specifically for the iPhone. It allows you to shoot single ideas to a MindMeister map for later development. If I'm really on the go and unable to get to my laptop, chances are I won't have time for much more than that.
I'll be looking forward to seeing the future development of these applications, and hopefully we'll see someone really push the limits of the iPhone's capabilities and create a brainstorming tool which doesn't beg comparison to a desktop application (or a Moleskine). Until then, these applications fit the bill for mobile mind mapping. Pop by the App Store to check out MindMaker and iBlueSky, and happy mind mapping.