I'm now cutting a fair amount of MDF on my machine. MDF dust is BAD (much, much worse than I want to think about).

Quite early on I found that collecting the dust at source is the only way to deal with it, so I made a simple polycarb/insulation tape hood for around the bit, and connected up a cheap vacuum cleaner. Only problem is that the vacuum fills up too quickly (10mins).

I wondered what other people are using?