I've had my iPhone for a few weeks now and am thus far incredibly impressed with the device.  Even though it has its major flaws the phone makes you feel like you're finally in the 21st century.

First I'll tick off my biggest annoyance  1) battery life  2) no MMS 3) no way to toggle Push settings via a timer 4) Apple is slow at approving application updates

I came from using a Treo 650 and the Treo would last for several days of heavy use before needing to be recharged.  By heavy use I mean hours of talk time, EDGE data downloading, etc.  With my iPhone I am finding I have to charge it twice a day.  It's a small sacrifice to make but I am sure that if I travel I'll need to bring one of those battery quickchargers (since my Macbook itself doesn't hold a charge too long, and

The most phone I've had with my iPhone thus far is using the 'Remote' iPhone app to control the music playlist at Thad's wedding.  Thad put me in charge of downloading wedding songs from iTunes and organizing them into a playlist.  He suggested I use 'Remote' to control the list during the wedding reception.

I hadn't yet used 'Remote' so I dug into it.  I found out that 'Remote' only worked on a wifi connection.  So I brought one of my old Linksys WRT54GS wireless routers to the wedding.  We had horrible luck with the A/V equipment at the wedding--but the router itself worked quite well.  I set up a 'wedding' wifi connection and had a laptop and my iPhone connect to it.

'Remote' was great fun to use, but it seemed incredibly finicky.  When it worked it worked flawlessly, but oftentimes it just wouldn't find the iTunes library even thougg I had a perfect wifi signal.  The highlight of my DJ'ing was when I got to start a Red Light Green Light game with the girls on stage dancing to Katy Perry's I Kissed a Girl.

On a side note, I hit a few buttons on my Treo today just for kicks and I saw that my Treo still has a 54% battery charge.  The Treo has been unplugged for maybe 3 weeks now.  I am sure if it had its cell antenna on it would have only lasted a week or so, but it's still impressive that it's holding such a charge on stand-by.  I was loyal to Palm/Handspring for years and I do hope that they make a comeback.

With the iPhone it seems as though I have to charge my phone twice a day in order to ensure that I'll be able to talk on the phone later.  I am travelling next week and am going to be looking at rapid backup chargers to ensure that I'll have juice whenever I need it.