Circuit simulator software... SPICE?

[two fingers]

So, I have used Multisim in school. But most of you guys seem to like SPICE. From what I gather, there are many versions out there. Which version do you guys like? A link to some help getting started (or even the title of a book) would be great as well.

Thanks for the help.

[fdeck]

Check out LTSpice. It's free and quite well regarded.

As I understand it, the computational SPICE core is pretty standard, and what differentiates programs is ease of use.

Did I mention that it's free? It runs fine under emulation on a Linux system.