Are those in the USA allowed to be used during a game?
Tabiya Scorebook: opinion please
Some tournaments do provide scoresheets in the US, but most will allow you to provide your own scoresheet if you prefer. Generally, they only care if they require you to turn in a copy of the scoresheet, and even then it will usually be acceptable for you to copy the game from your scorebook to a provided scoresheet after the game.
There is a TD Tip in the new edition of the USCF Official Rules that addresses this:
"TD TIP: Tournament directors are advised to be flexible on the above. Many players have their own scoresheet in the form of notebooks or recording devices, and prefer to keep their games in an orderly fashion within that book. If a player can provide a copy of the score from their notebook, or a printout or downloaded from the electronic scoresheet, this is acceptable. You have the score and the result of the game."

You guys bring notebooks of former games to the board? What about Chessbase?
Oh great, another potential way to cheat that I never gave any thought to. I guess it's possible to cheat by hiding information or good moves in the other pages of the notebook, but I think it wouldn't be that easy to do. The rules require that the scoresheet remain visible to the opponent and TD at all times during the game. It's highly likely that someone would notice the player looking through previous pages in his notebook.
However, if the notebook doesn't lie flat on the table, I guess someone could argue that the scoresheet isn't visible at all times. I use a spiral-bound notebook that lies flat, so I don't have that problem.
After a 10+ year break, I intend to return to tournament chess in the near future. Browsed online for a scorebook and came across the Tabiya Tournament Chess Scorebook. If anyone has used this, I'd be interested in hearing your review, especially with regards to use in a tournament.
They come in two different formats (standard and pocket) and several cover designs. You can read more about the scorebooks at ChessScorebook.com.
Thanks in advance.