More than one category for an entry?

Hi All,

In my blog I am writing brief reviews of cool items I find on the net.

Anyway, I will be tagging them such as “firefox” and “plugin”. Now, is there a way I can put it in 2 categories too? Because on my side bar I don’t want someone who is looking for a firefox plugin to miss it, because it is only in firefox OR plugin.

If I manage my tags correctly, can I have them on my sidebar instead?

I hope that makes sense.

Thanks,
Amnesia