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
Lapbook Lessons - you do have to become a member to use this site but it is free and it is well worth the time to sign up! They offer some free lapbooks, which are great, but my favorite part is the laplinks and places they have to share your own lapbooks... I have found TONS and TONS of awesome resources through them.
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.
Lapbooking on Squido - tutorials, lapbooks, articles, how to get started, etc.
Create your own crossword puzzle
Create your own word search puzzle
The Homeschool Mom - list of lapbooking resources