I still have some usability concerns with the dpad/button-cluster placement on the N810. I'd like to see something like my mock-ups, with 2 dpads arranged in the center sides (or upper sides, like where the N800 dpad is) and the camera and light sensor above the screen instead of to the side.

The other hardware things, though, I would agree aren't as critical. They're "nice to haves" (charge via USB, microSD/transflash, rear facing picture and video camera, tilt screen instead of kick-stand, WWAN (wimax, hsdpa/hsupa, etc.). Once the usability concerns are addressed, these "nice to haves" can, and probably should, take a back-seat to software concerns. And, hopefully, those software concerns don't have to wait for an N900 -- they can be done within the OS upgrades to the current tablets alone.

The things I think are "Must Haves" on the software side:

• Calendar/Todo app
• Sync app for contacts, bookmarks, calendar, todo with all of the following desktop/server based counterparts:
  • thunderbird/firefox/lightning/sunbird
  • Apple addressbook and iCal perhaps via iSync compatibility
  • Google Apps
  • (maybe Outlook/Entourage)
• Full IMAP client (can read all server-side folders, can use the server-side inbox/sent/trash folders instead of local ones, automatically syncs all IMAP folders when checking for new messages)
• Bluetooth PAN support (in addition to Bluetooth DUN)
• Fully supported integration with Bluetooth Hard drives, NFS, CIFS, WebDAV (windows "web folders"), and Apple File Share volumes.
• Support for Socks 4 and Socks 5 Proxies in the Configuration wizard (in the same dialog where you specify HTTP, HTTPS, and other proxies).
• Support for password protected proxies.
• Gmail Notifier should support logging into Google Apps hosted gmail domains, and not just the main gmail domain. (it notifies just fine, it just doesn't work when you tell it to go login)

These things are "Nice to Haves" on the software side:

• Act as Bluetooth keyboard and mouse for other devices (supporting both HID and SPP modes)
• Act as Bluetooth "handsfree" device for cell phones (display caller-id, dial calls, answer calls, route audio through NIT, sync NIT and phone contacts, send/receive SMS and MMS messages)
• Bundled OpenSSH client (keep server as an add-on)
• Built in VNC client (just like xterm is now built in) (use the zoom buttons for actually magnifying/demagnifying the display, and not as surrogates for mouse2 and mouse3)
• Easy to install and manage VNC server
• Support for "video out via USB" devices
• Office Software (view/edit Word, Excel, PowerPoint docs)
• Sync documents to desktop host via simple user interface
• Sync documents with Google Docs
• Support for USB modem/network devices (POTS modem, RTT1x/EVDO, GPRS/EDGE/HSDPA/HSUPA/LTE, WiMAX, Ethernet 10/100/Gig)
• Support for USB tethering with cell phones (via USB OTG port)
• Support for USB card readers
• Support for various Express Card devices via Express Card to USB adapters (so, EVDO Express Card plugged into adapter plugged into cable plugged into USB port)

(you'll notice I don't mention any media device oriented stuff; I don't use my NIT that way ... I wouldn't object to having faster video frame rate support, more codecs, etc. -- just didn't include them because they aren't on my radar)