Also I found a lesson plan book at Target a few weeks ago for $1, and it has a week by week calendar format which is very convenient to plan themes in, so it has been working out very well so far. Although I would love to be able to do things completely on the computer, it is more convenient for me to have the book to jot things down in and bring with me to the library, etc.
This week we are working on the "sh" letter combination, and the theme of the week is shells. Today after reading "What Lives in a Shell?" by Kathleen Weidner Zoehfeld and looking at a pile of real shells while discussing the animals that once lived in them, W made shell magnets out of foam stickers and glitter (glue + glitter always = a fun time). This morning we went to the library and also found a few other good theme books for our Sh week.