When my cloudtel business phone rings read the caller ID and log and create a new note in my CRM where I can write what happened and create actionable items. Highrise by 37signals offers a simple CRM with an API

Let me click a contacts phone number in my Address Book, and have my computer phone or even desk phone automatically call the person.

if the caller is unkown
"Nik is currently not available, if you would like to leave a message I'll ask you a few questions, please start with your name: (waits)
your phone number (waits)
the purpose of your call
Toss in some speech to text and BAM
If the user is recognized it would only prompt for the purpose of the call

build an app for integration with all my calendars, contact lists, tagging, etc.

Pickup my desk phone / my softphone / my iphone and say "call X" and it rings.

I travel a lot and if I could set my working hours myself, then only calls would come through when I'm awake, and otherwise forward straight to voicemail.

Automatically back-up voicemail's that are flagged as important on a regular basis and archive them.

An interface that let's me set-up a conference call online and that emails call details to those attending

Let's me record to-do’s, send me a text email, and then I can easily integrate in to iCal

Cloud Management with the .tel domain = Tel Office.
Having cloud based web content and a storage system such as .tel would deliver equals great workspace solution for sharing / accessing data and collaborating in the cloud, using .tel as the directory

let me pick what kind of hold music i want, or optinally no hold music (i put ppl on speakerphone while waiting on hold, but i always have my own music on in the background, i need feedback that the call hasn't dropped off but otherwise no music)

if expected to be on the phone for more than a few minutes I want to enter my phone number and get a call back (it could ring the company phone "a caller has requested a call back, call back now or in how many minutes?")

Allow creation of closed network of Cloudtel users with extension/messaging capability over the internet that is 1 to 1, 1 to +, or + to +

Develop a company website call widget, potentially a button that can go on my website that visitors can click and talk to our support, sales, etc. team directly

Can we get graphs/more information from phone, e.g graphs for incoming/outgoing calls, skydeck-like?

Integrate the caller ID function on the phone with a computer's address book. Especially useful for a database (e.g. Filemaker, MYSQL, etc.) setting instead of just a traditional "Address Book" application.

I would like to be able to choose from a set of custom ringtones for all or individual phones.

Let me know which router is best to use with the cloudtel system when I sign up.

Cloud content management with IVR and content creation service, like http://vflyer.com, enable use of .tel in context with 'office in your pocket'

Integrate with similar to ifbyphone.com, create call center to support office users, answer SaaS calls for the network.
This 'premium' package = say.tel / liveagent.tel / teloffice.tel
More use of .tel in conjunction with office in your pocket: be able to profile your .tel with liveagent.tel selected as contact phone creates 24/7 live agent calls for your business.