General: Lapbooks, Units/Themes, Lesson Plans, Curriculum
Homeschool Share - absolutely one of my favorites, and one I have mentioned before and recommended to most of my friends.
As a part of homeschool share they have a section of miscellaneous lapbook templates (I was able to find a really awesome book log for our ocean lapbook here) - as well as blank lapbook templates
Kidzone - this site doesn't have a lot of different themes but the ones they do have are great - I found both snakes and spiders on this one (as well as sharks) that have been extremely helpful.
Perpetual Preschool a site with lots of different themes there are different crafts, songs, games, science, food/snack ideas for each topic. Some themes are OVERLOADED with ideas... a great resource for putting units together for younger students
Homeschool Helper - offers free unit studies, free lapbooks, worksheets, notebooking pages, and even record keeping forms
Making Learning Fun - I found a lot of age appropriate printables to go along with our units at this site.
Lesson Plans at Discovery Education
PBS Lesson Plans
Nick Jr. Lesson Plans
Scholastic Lesson Plans
National Geographic Site - offers lesson plans, crafts and teaching geography
The Education Cafe offers free homeschool resources: worksheets, lesson plans, unit studies and more!
Hubbard's Cupboard - I have heard so many people recommend this site and have never really had the time to check it out (it's quiet large) but today I took a little time to sit down and do it and I'm impressed!! Lots of information on this site.
Classroom Snapshots - things that I saw here that I was interested in included, calendar binder (very similar to what we use, with links to printables), mini offices, science and social study themes - complete units)
PreKinders - printables, lesson plans, themes and more!! Love this site
Twinkl offers lots of printables and worksheets in every category/subject. It is a british site so the money printables are not American currency.
Making Learning Fun - Free printables (and some activities) for Pre-K through second grade covering LOTS of themes
ABC Teach - Worksheets and activities by themes
Have Fun Teaching - Worksheets, Flash Cards, Coloring Pages and more
KidzClub - worksheets, printables, flashcards, crafts and more
Chaos Appreciation has an entire homemade Alphabet Coloring Book available for print and download.