creamandcheese -
1) your initial question is overly broad. on-campus jobs means A LOT of things. there is work-study, there are jobs you work out of your bedroom, those are 'on-campus' of sorts. there is what i think they call casual work - for people not on financial aid.
2) a resource -
Federal Work Study | Center for Career Education - work study and then there are a whole number of jobs you can apply for that are like doing spreadsheet for a guy out in Boston as one of my friends did as a young
3) then there is the CCE website as a whole. that does have 'temp jobs' that you can grab that have as i mentioned like working remotely, or babysitting.
4) casual jobs usually you get by going to the department. some people i know worked as shelvers in the library or swipe cards in dorms. you get these by asking the departments associated with them. as far as i know there isn't one registry for these jobs.
5) jobs vary from department to department, but there is tons to be had. the longer you work, usually you get a raise.
6) your attitude in post this afternoon is completely unnecessary. your initial question was very bad because honestly it really could be covered in most of the threads. what you really wanted to know is "where is the listing of jobs;" to which the answer is, it depends on what kind of job you are looking for. if it is casual, i dont think you will find it, it is by going to the department and asking if they are hiring. if it is work study, you apply for those jobs only if you have work study. if it is other on campus stuff, you have to either apply for a job or work with a 3rd party.
7) undisclosed. CUTTA takes tons of undergrads to do translating.
Columbia University Tutoring and Translating Agency. the only languages that often are farmed out to people who have advanced knowledge (i.e. grad students) are arabic and chinese (and some other east asian languages). but to be honest, there is more money and consistency in tutoring.