I'm sure you'll find that there are a multitude of ways that they guys and gals here log their observations. Here is a handy resource for hand written logbook templates that you might like:
I used to hand write my logs a long time ago on templates similar to the ones here. I had a bound book made up of observation sheets that I would keep at the telescope.
Others may use computers as their log books, using software like:
and many many more apps. I like Skytools, but still own Deepsky as well (it has a lot of my old observations in it). There is always the problem of preserving night vision if you use a computer at the telescope for logging observations. Some people like to use a red screen overlay.
I'd be interested to know if anyone is using an iPad to log their observations, and what software they're using to do it with.
In years gone by, I used to log my observations into a minidisc player using a headset mic, and then play my observations back into my computer the following day, letting Dragon Naturally Speaking turn it all back into text for me. It worked surprisingly well. That's how all of the observations in my copy of Deepsky came to be.
I expect to be logging my observations again in the future and will probably head down the same path (but probably using Skytools), as it allows me to speak my observations whilst I view the object, rather than looking away from the eyepiece to write things down.
Of course, if you like to sketch, that's a different story, and then the templates at the top of this post might be handy for you. There are some really talented sketchers on the forums here and I'm sure that they would help you with the templates that they use at the eyepiece if you wanted to sketch.