mentioned. I've just recently learned about the heidisongs CDs & resources. They are awesome.
For my students use, the following:
http://www.abcya.com/kindergarten_computers.htm - This is a great resource. It has so many options for students to try.
Also, my school has bought a subscription to Destination Math. It is fantastic! It is a Harcourt product. My kids use it everyday during math groups. It is so engaging. Maybe your school could look into a trial version.
For me:
A week never goes by without looking at Making Learning Fun, Proteacher, Busy Teachers Cafe, Bookflix, United Streaming, and Carl's Corner.