Covering multiple activities with one LLC?

I do just what you are talking about. I have a Video Production business and my Scrapping business Incorporated under the same Corporate name. I don't know if it's wise to do that or not, but it does save some money in taxes. At least that's what my accountant says. I know being incorporated keeps your personal assets more safe if you kill or injure someone while working because the victim would sue the corporation, not you personally. That's the way I understand it anyhow. I'm no expert tho.

As far as cost, yes, it would cost more to have two llc's. And twice as much paperwork. Like I said I'm no expert, but I guess I would get a second opinion from another accountant and go from there. Also have the first CPA explain to you why it's a bad idea and report back please.