I use a large variety of neodymium magnets in my shop. I get them from K&J Magnets. A great use for strong magnets is to wrap one in kitchen plastic wrap then suck up steel debris (filings, steel wool shards, etc.) from a workspace, without anything actually sticking directly to the magnet. One thing I'm a little leery of, though, is magnetizing certain tools. There are times when a screwdriver or socket sticking to a fastener is annoying and counterproductive. Other times a magnetized tool is welcome.