CalcuLadder yesterday and Elias's reading lesson. Nothing so far today! But, I looked up free grammar resources for my 4th grader next year and got the following hits right off.

http://www.edhelper.com/language/language.html

http://www.dailygrammar.com/

http://www.englishchick.com/grammar/

http://webnz.co.nz/checkers/grammar2.html

I have not fully explored these sites and do not yet know if they are worthy of an official entry in the TNH links...but if I end up using any of this, I'll put in a link. One of them has some spelling resources online! Maybe I can manage to save myself the $50 for Spelling Power.