For printing, you could get AirPrint-enabled printers to replace any older units, but there are wireless printing apps for iOS devices that work with regular Wi-Fi printers. They cost about $10 per user device, so in some cases it may be more cost-effective to get a new printer.
For account management, iTunes today is quite limiting -- it assumes there's only one iTunes instance involved for each user. If you connect an iOS device to another computer's iTunes account, you're asked to wipe out the iOS device's contents and associate the device to the new iTunes account.
The reality is not quite so harsh: You can have apps synced to one iTunes account and media to another. The trick is to uncheck syncing in each account for the apps, photos, music, and videos you don't want wiped out. In other words, if you want your work PC to manage and sync apps, uncheck apps in your home iTunes. Note that you'll still get a warning saying your contents will be wiped out, but only files in the checked groups are targeted. Clearly, this is a messy process and not convenient for the average user.
However, in some circumstances, IT could deploy iTunes as a corporate app. One is for iPads and iPhones issued for strictly corporate use. By having iTunes on each iOS user's PC, you can essentially discourage access to personal media and apps. After all, if the employees synced the device at home, they would wipe the corporate resources, and when they synced at work, they would wipe the personal resources (and reinstall the corporate ones).
For shared iPads, you could set up iTunes kiosks and have employees sync to to a single account to get the same restricted set of apps, media, and policies installed on each device. Yes, people can log into their personal iTunes account and wirelessly download iTunes Store media and apps, so this is not a perfect solution, but it introduces a hassle factor that will discourage most users.
For broader usage, iTunes can be deployed as a corporate app as part of your standard image. Most people don't know iTunes can be configured to do as little as activate iOS devices, to just update iOS on associated devices, sync some types of content, or provide the full capabilities we see on our home PCs, notes Jesse Lindeman, director of product marketing at mobile device management vendor MobileIron. You could set iTunes at the office to sync specific content types and tell users not to sync those types at home.
But that use of the iTunes app is not necessary in a business setting, Lindeman notes, because you can download media and apps directly from an iPad or iPhone wirelessly. You need an iTunes account to do so, but not the iTunes software. The iTunes software is required for only updating iOS itself and backing up the contents of the device, although media and apps purchased through iTunes are also backed up at Apple's servers.
Few businesses of course distribute their enterprise apps via iTunes. Apple provides facilities for direct app installation, and in large organizations, you can use mobile device management (MDM) tools, such as those from AirWatch, Boxtone, and MobileIron to provision apps to iOS devices wirelessly, without conflict with the user's personal apps managed via iTunes.