Hi Neuro,
There are a lot more experienced programmers here that will be able to give a better answer. I am very much a newb.
Most of my programming experience is on the webside: HTML, Javascript, XML, ASP (learning PHP), or database side: SQL (SQL Server, Oracle). My internship is basically Flash programming, though I'm working on an ASP project that I'm having fun with. I've had the very basics in Visual Basic.NET.
The basic HTML or xHtml is extremely easy. XML is not difficult either, though I haven't done much work in it outside of class.
If you are getting into Web I suggest database also. To get further than basic pages you will eventually want to connect to a database and will need to understand SQL.
SQL and the web programs that connect with it such as ASP and PHP are logic oriented. Being able to follow "IF THEN ELSE" statements or keep track of a loop are pretty much the same no matter the language. Syntax may differ but the basic structure doesnt really change.