Yes, and you don't need anything fancier than an exercise book although it will require you to rule your own colums and rows as required for it. I rule mine as required at every summary, which because I fly often, is usually a monthly summary.

I just use a Made in China cheapie hardcover standard feint lined book ruled with colums to reflect the items pertinent to an RC log.

Whatever you use, the items you'll want as headings are Date, Model, Flight Time, # Flights, #Landings, & a longer section for Comments or Remarks. Rule double page. In my case because I fly regularly at two different locations I also have a small column where I can tick to annotate which location the AIREX was conducted at. For a guide, have a look at a real log book and just adapt your exercise book for RC. A log is especially useful if instructing or a student under training, and for keeping a record of flight, landing currency etc.

PS: Shawn's flight log looks very useful, especially for maintenance and budgeting. I wasn't aware of it before, but now that I am I'll download it and try using it as a supplement to my written (easily transportable) log. One of the keys to successful log keeping is to do it now. Discipline yourself to religiously write up your entries as soon as you can after each the days flying. Keep it simple. The entry doesn't have to be a tome or resemble "War and Peace". That way it never becomes a chore.