I use mine all day, every day.
In a typical lesson I'll be using some of these:
A Powerpoint running as they come in - images from WWI trenches with a recording of 'Dulce et decorum est' for a lesson on war poetry.
Or a piece of music with a 'countdown' clock & a 'tickertape' reading 'when the music stops, books should be out on desks, bags on floor & gobs shut, especially YOU, Liam' for a difficult class.
A seating plan (kids' names typed on to IWB photo of my blank plan done in Publisher, so if I want to move someone I can draaaag them across the screen ) - very handy for setting up group work.
Learning Objectives - on IWB flipchart for the lesson from when I prepared it, be that the night before or the year before, no-one's pratting about whilst I write them on a squeaky board with a dried up pen.
Most of our resources are created electronically, & stored on the network - so I can show them on the board & 'write' on the worksheet or whatever to show less able students how to get started. Because I've embedded them in the flipchart, I click, up pops the homework I'm handing out.
Videos. No more booking the TV & VCR & wheeling them down the corridor on a trolley, thereby de-tuning them going over the bumps...
Interactive quizzes - kids come out to the front & select answers, using pen thingy. OK, that one's a bit gimmicky, but it's engaging & can work really well.
A Venn diagram - we're comparing two poems, which themes/techniques go with one or both of them? More text dragging.
Annotating text - scan of the extract of 'Lord of the Flies' or whatever, for me to scribble on & them to copy on their own texts.
Exploring an image - if it's a GCSE task looking at presentational devices, we can all see that the writing looks like flames - why?
Using visualiser to display work - 'OK, we said that we were focusing on paragraphing today. Where could Jay have put a paragraph break in on this page?'
For GCSE, the spreadsheet of their coursework grades - 'Harry's given me his Romeo & Juliet essay this morning, so let's just input his marks - ooh look! 3 less marks he needs in the exam to get a C! Who's closest to their target this week? Sarah, it says here I still don't have yours...tomorrow, yes?'
RM Tutor if we're in an ICT room. I can control or block internet access, display any screen in the room to the whole class, IM specific students or everyone...
Flicking instantly back to anything used in that or a previous lesson - 'Right, so today we were looking at religious symbolism in the account of Fagin's death...here's the notes we made yesterday'
Room changes - no problem, I can access my lesson & all my resources on the network.
I love my IWB.