I'll give it a run:
When I wake up, I use Ping.FM via SMS to post my morning blood sugars to all my social sites (I'm diabetic, and it stirs up a lot of conversation).
While I'm showering/getting ready, i use NewsGatorGo for Windows Mobile to download new podcasts directly to my memory car.
On the way to work, I use my Motorola HT820 BT headset and listen to podcasts, usually from TWiT or CNET. Sometimes I've downloaded XVid encoded vidcasts from Revision3 and watch them using DIvX Player for Windows Mobile.I also have a few Looney Tunes cartoons re-encoded from DVD sets if I get really bored.
When I get to my store or the restaurant of the day (if I work later in the day), I update my Brightkite account via SMS, then I post a picture of how the day looks via e-mail. Brightkite and Ping.FM automatically update my Twitter and Facebook accounts, and Ping.FM also updates Jaiku, Pownce, and FriendFeed.
I also use Qik to record a little bit of video if I'm feeling really chatty.
Once my workday begins, I'm usually busy dealing with customers, so I keep up with Twitter and Jaiku using SMS, and I have Yahoo! IM, Live Messenger, and AIM running on my phone via the OZ client (uses SMS).
My phone is provided by the company, but I cannot have Exchange setup on my phone. I'm an hourly employee, and I can't check mail off the clock. I do have Nuevasync setup on my phone to sync my contact and calendar with Google, then I have my live.com address setup with Windows Live, GMail is setup using IMAP, and I have Yahoo! setup with XpressMail.
I also have a few songs sideloaded from Napster on my phone, if I want to/need to listen to music. It's a good thing the Blackjack II can support SDHC cards with all the media I have, plus I can use Live Mesh mobile to download more media if I forget something. (Side thought: Skydrive and Mesh need to merge now.)
I surf news via NewsGatorGo and the AT&T MEdia Net landing page, and most mobile-friendly sites with IE. I'm one of the lucky ones that got in on the Skyfire beta early, so I use that for full sites and sites that need Flash, like YouTube, last.fm, and other video sites.
If I get bored, I have eReader and free books from Project Gutenberg installed, as well as several games, some from EA, WINPlay. I also have AT&T Navigator installed to get turn by turn GPS, Evernote to store/view notes and pics, and Dashwire and Cellspin to upload pics and vids to sites.
All of this is what I use my phone for in a normal day, not including new sites and services I try on a daily basis. When I tell my customers I use my phone for 80% of my computing and living, I mean it!