WP 7.5 development

http://windowsphonegeek.com/WPToolkitBook

iquery for database connectivity

you may refer this links----
http://www.dotnetfunda.com/codes/code1533-simple-way-to-zoom-images-in-a-datalist-images-are-retrieved-from-the-data-.aspx

http://www.dynamicdrive.com/

Quick start for Caching

http://www.4guysfromrolla.com/articles/022802-1.aspx

http://asp.net-tutorials.com/caching/object-caching/

http://www.software-architects.com/TechnicalArticles/CachinginASPNET/tabid/75/Default.aspx