These days I prefeer C based languages, from the basic ANSI C to java, C# etc. I used to really like C++, but mostly in the original vision of Mr. Stoustrup, it's become much too "tainted" a language these days.
Previously I have been a big fan of Borland's Turbo Pascal and used VB from version 1 (the original 720Kb floppy DOS version) until the last version 6.
For students wondering what is the most beneficial language to learn, my advise is no particular language. In my position, on average, I perform maybe 2-3 interviews a month, and honestly, I don't care about language syntax/specific stills etc. unless someone thinks a specific language is the only way (which shows lack of understanding and the fast route to a no hire).
It's all about understanding the fundamental concepts.
For senior positions I will not even get into any language. It will be purely based on personality, design concepts and past experience.
For junior positions, I will ask algorithm based questions and require solutions on a whiteboard, but any language or psuedo they prefeer.
Howeder for contractors I need specific proof of skills in the specific field they are being considered for. So if you are a Java developer and you are applying for a C# contract, there is no chance. Well actually it's unlikely that applicant would make it past HR