What I use for mulch is brown leaves, newspaper and grass clippings. After the yard has been mowed, I go out there and rake it into piles. Then I come by with a wheel barrow to collect it, and dump it in a pile beside my garden. With a grass catcher attachment on the mower, this would be even easier. I try to stockpile the grass so I can gradually pull weeds and put more mulch down. Right now, probably 75% of my garden is well mulched. I try to get out there every week and mulch a new area. Once an area is covered in grass clippings, it can be left for days without weeding. Once a week is sufficient to pull small weeds out.
Do you mulch? What are your favorite materials to mulch with?