Adobe illustrator.The New Adobe illustrator is available on line. If you are a student you can aprox £3 great discounts.The usual fee for the full package is £1800 if you are a full time student, it is a lot cheaper approx £350.I have seen the student version CS4 for £99.00.You need at least 2 gig on your computer 3 gig would be more appropriate or a least 2.5 gig.
