I love my little Neti pot. It looks like this one:
I bought it after catching an episode of Martha wherein she has someone demonstrate it live. Looks hilarious! But I always wanted to try one, and this video definitely encouraged me to give it a go.
Let me tell you what: whenever I don't use it at the first signs of impending colds/allergy attacks, they knock me down for several days. Since I've started using the thing, I'm usually back on my feet in a day. Mind you, I still feel somewhat meh, and I might sound horrible, but I feel better.
Any time I mention it and my listener says, "Oh, but I do use my Neti pot!" and they're sick for days, I get the feeling that perhaps they are using it as a paperweight.
Yesterday, I commented to my co-worker Eric that they may be addictive. I've caught the local plague, and have been using the Neti pot every morning. I don't think you're supposed to use it multiple times a day, but boy, I sure want to!
If you've never used one, seriously, it's the best thing since brushing teeth in terms of hygiene!