Diane asked me a question on my Facebook wall, "My daughter is going into the 9th grade and I am looking for a good language arts/grammar program. Do you have a recommendation as to where to look for one? Thanks."
There are SO many good language arts and grammar programs out there, I can't point to one and say "that's it!" It also has so much to do with the curriculum being a good "fit" for your child. Having a good fit is much more important than having a fabulous curriculum that doesn't fit! If you are completely stuck, check Cathy Duffy's 100 top picks.