If you can get training on OO, and design patterns, Test Driven Development (TDD) and Domain Driven Design (DDD). Topics like this are technology independent and will help you improve your general coding skill and deliver better code.
As for what .Net technologies you need to learn this depends on the applications you plan to implement. Without knowing exactly what you'll be implementing I'd recommend that you learn a language C# or VB.Net well, as other technologies such as sliverlight entity framework etc will build on your language skills.
Also you mention web technologies therefore Azure could potentially be of interest to your company, my own knowledge of this is limited at the moment but if you develop sites that have traffic that peaks at certain times Azure might be worth considering.
Again as you mention so many web related technologies I would make sure and learn CSS and jQuery, again these are platform independent allowing you to take these to any platform in the future.