Thanks to all those who've answered so far.
The reason I'm interested is 'cos I'm a developer, and I want all my software to look good on typical systems.
<Long-winded explanation>
The DPI seting is provided so that people with non-too-brilliant eyesight don't have to strain their eyes. At a higher DPI, Windows scales up all its drawing so that objects that were previously drawn at a size of say 100 x 100 pixels now span more pixels. Consequently they appear larger on the screen.
The hassle for developers is that we've got to scale up all our drawing too, otherwise things can either end up misaligned, or suddenly look ridiculously small in comparison to everything else.
Now although I am scaling, I've been aiming my screens to look their absolute best at 96 DPI, which for a long time has been the standard Windows setting (in fact if you try a large DPI, you'll find that Windows itself doesn't always do a brilliant job of drawing things - icons don't always get resized too well)
So what's this got to do with TFTs?
In the past, manufacturers would often ship systems at less than their highest resolution to suit people with poor eyesight. So, let's say they're using a CRT in a system that can go to 1600 x whatever, well they ship it set to only 800 x 600 or maybe 1024 x 768 so that, when first used, all customers will be able to use the screen. If your sight's good, you'll fire the resoltuion up within the first 5 minutes of course.
But now most systems come with TFTs. You don't want to run a TFT monitor at less than its optimal resolution. So as a compromise, they often ship with a higher than normal DPI.
So, I was just wondering if most people with TFTs are still running at 96 DPI, or going for a higher setting. I guess many people here have built their own systems, but still, if you've got a physically small monitor with a high native resolution, you might go for a higher DPI (or drivers might preselect a higher DPI by default).
If there's a new "sweet spot" DPI setting, then I should take this intoaccount in my drawing code.
</Long-winded explanation>
Hope that makes some kind of sense!!