in my experience, after you've gotten your first job marks dont matter. it usually comes down to where your experience has been. marks will make a difference if you're going for corporate graduate recruitment programs, big corporations basically sit down with a checklist and if you cant tick all the boxes they dont waste their time with you. this is where high marks help, but keep in mind theres a lot of people with perfect GPA's who dont get graduate recruitment places, simply because hundreds of people apply for usually 2 or 3 positions in each company.
at the end of each year, thousands of graduates flood the market trying to get a finite amount of jobs. what you want is to be able to differentiate yourself from all the others. high marks alone will not do this. like majesty said, get some experience (any is good), and i would add get to know people and the issues in your industry. how you do this is up to you, but its not a subject you can take at university
also work out what it is you want from your degree. i want to be able to do a post graduate course in an area that interests me. being bitter and cynical, its all just a game to me, and im just here playing the game because if you live in modern society you have no option otherwise.
ranting aside, twice ive been interviewing for IT jobs. especially in todays climate, i could pick up the phone, place an ad for a given role and get 10 people all who have the technical competence to do the job. in my experience, the deciding factor comes down to what we think of the person, and how well we think they will fit into the companies culture. its not the marks they got in uni, nor how many certs they have (like CCNA, MCSE, etc).
excluding last year, i have shit marks and a shit academic record (it took me four years to get through first year, i think with a GPA < 2) but, people pay me very well to do what i do because ive worked very hard at being good at it and differentiating myself from the crowd. it wasnt easy, if it was easy, everyone would be doing it and we'd live in a utpoia, but it's worth it to me. now im at uni to do postgrad in something that interests me. education has its place and undoubtably degrees open doors, but marks matter far less than individuals.
oh, and dont get me started on working for big corporations