Not about my children, but the school I teach in! I think we do pretty well, but could be a bit more inventive.
A previous school I taught in by the way, launched a big and quite complex incentive scheme - or rather, one of the VPs started it, ignored the advice of many staff members, and though it had a fairly positive effect, there was a feeling that it was a bit unfair to the good but quiet pupils who aren't outstanding but just get on with work etc. (sorry that sentence was so long, can't be bothered to re-punctuate) It also became v expensive - to have rewards the pupils will value costs a lot of money, especially in a big school.
In my current school we do internal reports roughly every 6 weeks - not based on academic achievement, but on ongoing work in class, behaviour, attitude etc. Pupils get a grade for each subject. Head of Year collates results and those with a certain number of A+ grades (A is the expected level)are sent a letter of congratulations from the Principal. Those with a certain number of B/C grades also receive a letter...and are then put on a report card to monitor their effort and work. The Year heads keep a running total throughout the year, kind of like a league table, and the top three get an additional reward at the end of the year.
The kids do respond well to this, especially at Key Stage 3 - a couple of weeks ago I had a big chat with a 13 year old boy in my form class who was close to tears because he hadn't got a congratulations letter. His effort and work had slipped, and the system helped him acknowledge this and begin to improve.
In my classroom, each Key Stage 3 class has a star chart, they receive stars for good work, homework, behaviour etc. Often I'll link this to a target for individual pupils. Every half term the 'star' of the class gets a v unhealthy chocolate prize. Again, the kids respond well to this, especially the lower ability classes, they often point out when another pupil deserves a star. In fact, some of my GCSE and A level students have been known to ask for stars!
We don't have specific incentive schemes for pupils with poor behaviour or attainment, however we do have quite a lot of trips, random days off timetable, residentials etc. We make a conscious effort to involve pupils from the bottom classes in some of these, and some have had a really positive impact.
That was long and rambling - hope it helps!