I like the jmeacham site for testing ideas and this one:
http://www.mrsperkins.com/
This site has Dolch site word assessments and math assessments. To see the math assessments you need to click the testing and forms link at the top.
For first day morning work, I make up a short packet (3 pages; printed on both sides) of review from Kinder. I include a picture to color on the front (something like: First Graders are #1!). I also include a number & ABC dot-to-dot, color by number, match the uppercase to the lowercase letter sheet. Simple things like this ease them back into school work. Plus, most of them don't finish it that first day so they keep it to work on throughout the day or week.