My method is this:
The last week of school I send a packet home through the students who need to get it. The packet is a lot of work, and takes me several weeks to get everything together, but it's worth it
The packet includes a "cover letter" with a check off list of needed items for the next school year and all the forms/information the parent needs to start off the school year right! It usually has: forms needing to be completed by a physician, reminder for immunizations needed over the summer, a reminder to parents to pick up mediation still at school. I e-mail the teachers a few days before to let them know I'm going to give this to them to send home, and explain the importance of it (I keep it short & sweet though or it won't get read ;P)...then I e-mail them in the afternoon right after I've put them in their box (and before they've fled the building!) and tell them basically "it's in your box...give to your students in the AM!". I also call the parent to let them know to expect it, and tell them to call me if they do not receive it that afternoon so I can send it again. If I can't reach them by phone I just go ahead and mail it out. I also make a copy of the "cover letter" and put it in my "August" folder so I have it ready to send home the first day of school. If you work through the summer, or have a long pre-planning period, you can start calling parents and getting info faxed before school even starts.
Sorry this is so long! Care Plan creation is so important...is is probably the hardest thing we do! Everyone wants to be ready to go by day one, and unfortunately, that's not reality...but at least you will know you have made an HUGE effort!
I have a decade in doing this, and this works best for me...but I'm open to any other ideas anyone has! I've tried several ways, and nothing has been 100% effective (yet...still working on it!).