Continue with VB6 or new launguage?

[Hack]

Moved to General Developer

I would definitely "move" to new technology - .Net.

Learning T-SQL, PL/SQL and similar variants is also worthwhile.

I agree with both of these.

Regardless of whether you go the .NET route or the C++ route, SQL, in one form or another, is essential if you are doing to be doing any kind of work with databases.