On the software market of editing vector graphics the biggest companies would be Corel and Adobe. To use such a program at home Adobe Illustrator or CorelDraw, no problem. The number of users who use these programs at home (“for use intern personal") without licenses is almost 90%, but the companies based on activities that involve digital graphics, he must take out some $$$ from the account (Don't understand that I recommend someone to use Adobe Illustrator and CorelDraw without a license. Be it a home user or a company). Licenses they are not cheap at all and the fines collected by those who do not have a license for these software are not milder either.
Adobe® Illustrator® CS4 – $600 or $200 to upgrade.
Adobe® Illustrator® CS4 – software is a comprehensive vector graphics environment with new transparency in gradients and multiple artboards that invite you to explore more efficient ways to design.
CorelDRAW® Graphics Suite X4 – $429.00 or $200 upgrade.
CorelDRAW® Graphics Suite X4 – With vector illustration, page layout, photo-editing and tracing software, CorelDRAW® Graphics Suite X4 is ideal for professional and occasional designers tackling any type of graphics project. Precision design tools, market-leading file compatibility and high-quality graphics content help you turn your creative ideas into professional results.
Inkscape It's a software open source for vector graphics, similar to Adobe Illustrator and CorelDraw, which uses the standard W3C in format SVG (Scalable Vector Graphics). It does not have all the functions of paid programs, but it has enough tools to create a desired graphic creation. It is ideal for companies and home users.
Supported operating systems: Windows 2000/2003/XP, Mac OSX & Linux

The image above was created with this wonderful software, but if you want to convince yourself of its capabilities, you can try Inkscape on your computers
Creations by Inkscape: inkscape.deviantart.com/favourites/
Inkscape
An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format. Inkscape supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more. We also aim to maintain a thriving user and developer community by using open, community-oriented development.