OK, I've been to Europe before. I know they (generally) use electrical outlets with the two, round plugs. I have the adapter plug ( US-style, two flat plugs go in one side, the adapter's two round plugs go in the wall...). Been there, done that.
Our collection of electronic gadgets has been growing in recent years (this year we're adding a GPS to our multiple cameras, etc.), and in the past we've been confronted by a shortage of available outlets for all our gadgets: especially in older hotels, we've often found that there's one (double) outlet in the room, and the lamp is plugged in to one part of it, leaving only a single plug available for our multiple items. The solution? A mini power-strip (like the one your computer is plugged into, only compact and made specifically for travel). I've got the "Outlets To Go-4" unit from Monster Power. This is a great unit, worked like a charm on our trip last year to Indonesia and Thailand. It's nice and compact, and provides 4 outlets (and yes, all our electronics are 110-220 friendly, so no issues with the electricity itself).
One potential issue, though: the power strip uses a grounded plug (like other US grounded plugs, it's got two flat prongs with one round one below). Our European adapter plug accepts two flat plugs.
The grounded plug on the power strip does go into the adapter plug, and it should fit into a European socket (the third, round, prong - the one that does the grounding - just doesn't go into anything, but it doesn't block anything either).
I'm wondering if there are grounded-US to grounded-European plug adapters available?
Or should I just not worry about it (and hope I don't cause a fire...)?