I just sold my tow-behind lawn sweeper for $20. I mow often enough (every 3-4 days) that I don't need to clean up the clippings. The sweeper only worked well if you let the grass dry up a bit, and bounced too much on the rough parts of my yard to do a good job. If you have a small yard, they do make walk behind sweepers that shouldn't cost too much. If you have a large yard, I would look into a grass/leaf vacuum type system with the hopper that goes on the back of the mower, or in a cart. Much more effective from my experience.
I also rake all the leaves up in the fall, only 3-4 big maple trees here so it isn't too bad. I forgot to rake them all up before winter one year, and it was a big, wet, moldy mess in the spring. If you have a lot of leaves, the vac attachment for a riding mower would be the easiest way to go.
I also pick up all the sticks from the maple tree with a grabber, I don't like to mow over them.