Hi V.!
I too have a 4 1/2 year old (5 in mid November) - so I feel your pain (we also have an almost 2 year old). We've had a sticker chart that we have used pretty consistently along with 1-2-3 Magic (and when 1-2-3 magic doesn't work, he has to stand with his nose on the wall . . .when I first heard about this, I thought it sounded mean, but wow . . .he hates it and he does his 4 minutes at the wall when he can't sit in his chair/on his bed for the 4 min time out).
Here are the things that are on this week . . .
I will . . .
follow the rules (and this is after long talks about what the "rules" are)
Act like a big boy (because we have times where he doens't act his age)
Be nice to my brother and my friends
Not negotiate (because it seemed like *everything* was a negotiation for a while)
Not throw tantrums
Not screw around at nap time (he still takes a nap a couple of times a week and if he doesn't sleep then he must lay in his bed with some toys and play quietly).
Others we have had on there (for esteem boosting/easy ones) is brush teeth every day, make bed, help mom/dad with chores - these could be as easy as helping set the table or putting clean clothes back in his drawers.
We switch it up every couple of weeks and add things that we know he needs to work on.
If he gets "x" number of stickers then he can get something special (new coloring book, etc). Involve him on what he thinks he needs to work on and what he might want to earn at the end of the week. Sometimes that positive reinforcement goes a long way, sometimes not. These kids keep us on our toes, don't they?
I hope this helps.
B.