Grading Programs/Lesson Plan Program

With all the new technology, I find myself creating tables and various spread sheets to use in the classroom since we have to document everything, but I'm having trouble with deciding what is a good grading program to use with Windows XP to purchase to make the task of grading students easier. If anyone knows of one please let me know the name, estimate in price and the location where I would be able to purchase it. I would also like to know if there is a lesson plan program for Windows XP that makes it easier to create lesson plans. I'm open for ideas, thank you.