It would be nice if tablets could interface with printers and other peripherals and come with a functioning Office suite. Flash and copy/paste won't hurt either.
BTW, the iPad has copy/paste since ever, as does every Android device. Most newer Androids also support Flash. At home, I print about a page per month on average. Do you need printing so much? What do you intend to do with the printout? Fax it?
Are you using something derived from Windows Phone 7? Last time I heard, it didn't support either.
As far as Office suites go, the iWork apps on iPad definitely cover everything most users need. I've had no problems creating documents in Pages on iPad and submitting them to my college which requires everything in Word format. The first couple times, I doubled checked and made sure the exported file looked fine on a computer, but now I just send them in directly from iPad. It's worked great for me, and I think it'd cover what most need from home and even business use of Office. The iWork apps are easily some of the most feature-rich on iPad.
This is my main beef with the current tablets; it can't be your only computer, you have to have another to update it from/print from (if you don't have a wireless printer) etc. I would love a tablet that was powerful enough to run a full blown OS, be it Windows or OSX, but run with a tablet specific skin over the top. 95% of the time I would use it just as one would use an iPad now, but in those 5% of times allow me to use the full OS, load up Word and edit a document, run some random Windows program, connect to a VPN etc.
Tangent:
Of course I say that, yet I've seen plenty of Linux-based consumer grade routers fuck up printer sharing despite using CUPS. I suspect most of the usual suspects (router makers) won't get in there before Apple. (plus they'll completely fail at marketing that aspect if they do)
I often wonder if there would be a sufficient market for a "better Timp Capsule", i.e. a well-done, pimped-out NAS/Wifi AP/router/printserver, specifically targeted at iPad/Smartphone users (but which works fine for other computers as well). The user experience of all the devices out there (apart from Apple's) is absolute shite, and Apple's are kind of limited.