I believe the following links would be usefull for you.
www.smashingmagazine.com - The ultimate collections of Free Vector Packs. Many of the vectors featured here would be useful for particular styles of design and specific types of websites and also have many sources.
www.arsenal.gomedia.us - Vector samples, Tutorials, Photoshop Brushes, Textures and many more
www.roundpixel.org - You can use whatever is on this page for whatevr you want. you can modify, alter, multiply, combine etc. You can use these for personal or commercial purposes.
www.vectorjunky.com - Vector Websites, Vector resources, Share Vector, Vector Graphics available for download with alot of free vector graphics ideal for your designs. Just download and enjoy.
www.freevectors.net - Online huge gallery of free to use vector graphics. All the images on this site are free to use for personal use and most of them can be used commercialy.
www.vector4free.com - Rare collection of vectors. All the vectors on this site are free for personal use, many of them are also free for commercial purpose. Still, always remember to check terms of use before using
www.crazyleafdesign.com - Free Vector Downloads - The largest collection of free vectors ever assembled and many more resources
www.vecteezy.com - Vecteezy is an index of Free Vector Graphics available for download by some of the best artists around the world. The site is updated every day, so be sure to check back often.
www.vectorportal.com - Vectorportal is huge database of free vectors which users can freely use for their commercial and personal projects. During 4 years of existence They have been repeatedly voted as Top 10 free vector resource by various graphic design sites. Those free vectors have been used for creation of ads, flyers, banners, business cards, book covers and logotypes by professional designers around the world.
