Can anybody point me to some really good resources, guides, videos etc for umbraco website development.

Our firm has inherited a couple of these sites from another company and your's truly has to somehow or other maintain them. I've set up a windows host and migrated the sites and everything is running fine but I'd love to know how I go about making an umbraco site from new. I've got visual studio etc and am willing to learn ASP.net, C# etc.

I've always been an PHP/MYSQL dev using open source stuff, and always thought that I'd burst into flames if I touched anything Microsoft but this stuff looks like it might be useful. Whoever would have thought eh?