I just found this wonderful site thanks to Sassy in Second. Take a look at this video. When I first started teaching I'd did something similar to this. It just reminded me that I should start to do this again this school year.
If you register with the site(it's free) you get your own on-line lesson planner which will allow you to save your favorite videos. You can even choose when you want to be reminded about the lesson so you won't forget. I know I come across lots of ideas and I bookmark them, then promptly forget where I bookmarked it or I have so many bookmarked that it's impossible to find. The other neat thing is you can add any wonderful idea you find on the thousands of fabulous teacher blog we stalk, to your lesson planner.
Here's another one to use during math time. It's geared towards K but I can change it to fit first grade.
This one has two good place value games. This one is for 2nd grade but I can certainly see implementing this later in the year or even changing it up a bit to use during the beginning of the year.
You should take a look around.