I use humbuckers for rock,blues,jazz and single coils for country (Chicken Pickin)

Cool. Any more suggestions??

I use Humbuckers for strictly my rhythms & passages; will use them in any solo situation that covers from open string(any) to the 9th fret (80% of time)... not higher.
For my single coils i mostly used for covering the rest of the neck (9th fret up) in solos (the neck position) and exclusively for acoustics & cleans (middle pos. with the humbucker splited sometimes) 99% of time...
but that just me...

Whatever gives me the right feel at any given moment. In distortion I use both. In clean I lean towards the singles.

I like both, though on Strat-style guitars I like a bridge 'bucker mixed with the neck/middle singles.

On a mahogany guitar...P-90s are the only singles that sound good to me (or close copies thereof).

The best thing about singles is their heightened sensitivity, compared to 'buckers. You can really color single coil sounds with EQ and tone knob adjustments. Buckers tend to be less resilient.

Most of the time I play my Strat on middle and bridge pick-up. It's a bit smoother and not as harsh than just the bridge pick-up. If I need a warmer, fuller tone I'll use my mahogony Schecter with humbuckers. It's great, but my Strats are a bit more versatile and they cut through the overall sound and can soar above the music without increasing volume or overpowering the rest of the band.

Cool... I like to use Humbuckers for Clean sound Reggae. With distortion it gets a bit heavier..

It depends. Since I mostly play metal, I use humbuckers almost exclusively, even for clean tones. But when I want that bite that only a single coil gives, then I use my fat strat and use the middle pickup. Usually when I'm messing around with blues. Everyone has their preference, this is just mine.

i use two strats, one SSS and one HH. the humbucker is definitely better for hard rock and even stuff like queen, surprisingly (but not really considering how hopped up the red special is). the single coil sound is good for stuff like funk, blues, etc.

I really like both. For jazz, blues, and most clean or slightly overdriven work, I like using the neck single or neck / mid combined. For rock, obviously a bridge humbucker is the way to go, but sometimes (especially for rhythm guitar) I prefer the trashy sound of a bridge single coil.

I have "discovered" a really interesting tone with the neck / middle singles. I play through a good amount of gain (my tubescreamer maxed out on the clean channel), and I roll the tone knob back to just 2-4 above all the way down. When I do this, it gets really cool, weird vocal-like harmonics that come out of the sound, especially when doing legato runs. I like to use it on ballads and laid-back fusion stuff.