I've already decided to get rid of that Ti, in fact.
Basically, it's wonderful to see that QuartzExtreme really helps take some load off the processor. This helps the G3 more than a G4, I believe, as some of those routines are/were AltiVec enhanced.
In everyday use (browsing, mailing, writing short stories and poetry, switching between large applications like GoLive and Photoshop), the iBook 800 definitely beats my TiBook 500. Yes, it has 640 instead of 512 MB RAM, but that shouldn't make TOO much of a difference, I suppose.
The machine feels more sturdy, which I like, and it's small, which I like, too. Guess a 12" PowerBook would have been THE machine for me, but for one I didn't have the money for that (yet) and then I heard they get hot, which I believe, coming from a TiBook.
The fact that a small firmware hack enabled monitor spanning made the TiBook sellable for me. Now I can work on my designs on 1280*1024 + 1024*768 and that's enough space for what I'm doing (layout of brochures and my books, designs for web applications etc.).
I'm also glad I didn't opt for the 700 MHz version. I wouldn't have needed the 100 MHz nor the CDRW/DVD Combo drive, but the VRAM is important. While the graphics card of the Ti was 'okay' at the beginning, that's where the Ti showed its age. So I'm happy I got that iBook.
However, if money hadn't been an issue, I would have bought the PB12 maxed out with a SuperDrive, of course.