Generally CS has very little to do with web-design -- but the specifics are vary depending on the specific program.
<< What kind of things do you learn?
Usually you start off with an introductory programming language such as Java or Python (first semester CS 101). The first "meaty" class you'll probably encounter is Data Structures and Algorithms but different programs may break this up into two classes "Algorithms" and "Data Structures aka Machine Structures". Other theoretical CS classes are Automata Theory, and Artificial Intelligence. Most programs will also have a healthy dose of applied / practical courses such as Database Programming (SQL), Software Engineering, and several specific programming languages.
<< What careers are available.
Many, it of course depends on where you want to go. The most common is Software Engineering, which means you write code. You can of course go into other technical areas such as Network Engineering or System Administration. You can also go into a more business orientated role such as Sales Engineer or Product Manager.
<< What's the pay like?
That usually depends on YOU and not what you studied. Technical / IT / Engineering jobs typically pay more than all liberal arts degrees and are competitive with other engineering degrees (chem, electric...etc). However it will vary depending on your region and the job market when you graduate.
<< Women in CS/Engineering
Def. the minority but becoming more and more common. There are a few programs that try to encourage women in engineering roles. See the Anita Borg institute for Women in Technology which has Moira Gunn as a board member.
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