Among the crowded field of cloud sharing and file synchronization services, there are plenty of interesting options (we’ve been partial to Dropbox around here, but check around for more), but when you add ‘must work well with iPhone’ to the requirements list, the choices narrow a bit. I’ve been testing out two business-focused options in Readdle Docs and box.net, and two other iPhone-friendly options (ZumoDrive and Drop.io) have just poked above the horizon.

Readdle Docs may be on the pricey side for the App Store at $9.99US, but there’s a lot of functionality bundled in to that ten bucks. In addition to turning your iPhone or iPod touch into a WebDAV file server — accessible easily and securely in the Finder, Windows Explorer, or via clients like Transmit — Readdle lets you access hosted storage on your MobileMe account or other WebDAV services. Once you get the files onto your device, it’s easy to view all iPhone-friendly formats, or forward documents and images by email. I’m particularly fond of the full-screen PDF and PPT viewers in the app. Of course, it’s no Documents to Go, but it’s a good start (and for those waiting eagerly for D2G to arrive on the iPhone, word from DataViz is that the app is on track for a Q2 release).

While you can use Readdle with iDisk or any WebDAV-enabled storage service, you also get a bonus account on the Readdle servers with 512 MB of storage (yes, not much, but it’s handy). Upgrades to the Readdle storage start at $5/month for 2 GB. On the other hand, if you need the cloud access but not the onboard server, you can save $2 and get Readdle’s OneDisk product for $7.99.

Though box.net is focused on enterprise users, it’s plenty functional for personal use; with a free 1GB storage account that permits 5 collaboration folders and files up to 25 MB in size, you’ve got some room to maneuver (paid plans start at $7.95/mo). The companion iPhone app, also free, lets you upload images from your photo library or camera, view a list of recently modified files, and open up any of your files for viewing (unfortunately the new box.net webdoc format reads in as raw HTML, which is a drag). You can also forward sharing links to your colleagues directly from the iPhone app, which can be extremely helpful in the midst of a collaborative project.

For the past month or so, developers have been taking advantage of an opening in the iPhone SDK to enable Emoji emoticons on non-Japanese iPhones, without having to resort to jailbreaking. While I was a little taken aback by the fascination and little mini-market that sprouted up around Emoji activation, it’s clear that the public likes its icons.

Unfortunately, the Emoji free for all may be over. Gary, from Typing Genius, e-mailed us this morning and he let us know that Apple is cracking down on Emoji activation outside of Japan. According to Gary, Apple is forbidding Emoji-only apps (Emotifun and iEmoji have both been removed from the App Store) and requiring developers for apps that do more than just Emoji (like Typing Genius — iTunes link) to provide an Emoji-free update immediately.

In regards to Typing Genius, Gary says that:

AirPhones is an interesting application for your iPhone or iPod touch that turns your mobile device into a set of wireless headphones. The idea is similar to Rogue Amoeba’s Airfoil, but instead of routing audio from your Mac to an Airport Express, AirPhones sends your Mac’s audio to your iPhone or touch connected to the same WiFi network.

For this to work you have to install the free Mac server application. It adds an additional output device to your Sound preferences pane. Once that’s installed on your Mac you’ll also need the mobile application (iTunes link) installed on your iPhone or iPod touch. After they’re connected through the same network, your handheld should play your Mac’s sound output.

This actually strikes me as a great idea. I spend a lot of time at my work desk listening to music through headphones and I inevitably get tangled up in the cord. My main concern, I suppose, would be running down my iPhone’s battery, but that may be worth it to get rid of that cord.

Filed under: Analysis / Opinion, Gaming, Odds and ends, iPhone, App Store, iPod touch

This one’s impressive — Zen Bound originally started out as Zen Bondage, a physics game/sandbox where the goal was to wrap a rope around a 3D shape or object. The game has just recently been ported to the iPhone, and in the process has actually been improved — the graphics look sharper and the iPhone’s multitouch controls really add to the tactile experience.

As a “game,” it might be questionable — it looks like there’s a lot of fudging in terms of whether or not the rope has “covered” the object, and the scoring system itself is more or less tossed in as just a reason to get you to interact with the objects. But as an app, and a demonstration of the kinds of interactivity that can be exclusive to a device like the iPhone, it comes highly recommended.