Icon Eden is featuring 3 free & quality icon sets.
First one is: Bright!. An icon set that contains 148 crisp-shaped icons that are suitable for web applications, multimedia and software. The set also comes with the EPS files.

Second one is: Milky. A set of 131 icons in green color. They are 64*64px & 48*48px size and in PNG format.

Third one Fresh Add-on. Fresh is normally a premium-paid image set but these 59 icons of that set is free. They come in all of the common sizes & formats.
The set contains application & financial symbols.

All of the 3 icon sets are free for both personal & commercial use.
DragonArtz is presenting 94, very nice & free, background images in PNG format.
Images are very ideal to be used for any purpose including website, banner design, etc.

Images are in 4167*4167px size & in different colors / designs.
There is also full-preview of the images at the DragonArtz website.
This is a free icon set with 50 PNG icons.
The icons in the set are glossy (web 2.0 look) & very nicely done.

Sizes of the icons are 52*51px which is kinda unique.
Simplicio is a simple looking but a quality & free icon set.
The set has 78 icons & the download package consists of ICO, PNG & AI files.

Icons are in 128*128px size. They are created by Neurovit & published by Smashing Magazine.
UniTip is an easy to implement & customize cross-browser tooltip script.
This tooltip script is also lightweight & accepts HTML to be displayed.

UniTip uses transparent PNG’s for creating the tootip balloon. And, for better compatibility with IE6, Unit PNG fix is already included with the package.
The script does not rely on any JavaScript frameworks & can be applied to specific tags or classes.
Requirements: No Requirements
Compatibility: All Major Browsers
DryIcons presents 16 beautiful & free icon sets that you can use in your web applications & designs.
Icon sets include:
Grunge Icons

Sticker Icons

WYSIWYG Icons

And many more.
Tip:
There is also a free graphics part in the website where you can find some great free vector graphics.
Function Icon Set is a set of 128 high quality icons in PNG format.
Sizes of these free icons are 48*48px

The set includes:
- Social bookmarking icons
- Speech icons
- Folder icons
- User icons
- Credit card icons
- & more..
Icojoy has beautiful free icon sets including web development icon sets, pixel icon sets, rss icon sets & smiley icons.
This is the 4th part of their web development icon sets. Click here to find their all free icons.

Package: 60 icons
Sizes: 24×24
File Types: .png, .ico, .tif, .gif, .bmp
Colors: Colored with and without shadows, with a subtle gray shade and transparent. .Bmp, .gif formats are optimized for lighter backgrounds
DaPino is a blog that presents beautiful free vector images created by Pien.
You can find lots of different vector resources from birthday cards to price tags, badges, human figures & more.
This great design resource is updated regulary and you can find new vectors almost everyday.
Here are few examples from DaPino:
Vector love flowers:

Some vector design elements:

Vector wooden labels:

DaPino is definitely a must bookmark for every designer to find new things everyday for using them and to get inspired.
Dragonartz created a nice set of 8 free vector web stickers.
The set comes with 1 main EPS file and PNG files of every sticker.

There is also another set of vector stickers by Dragonartz which covers the different colours of the first circle sticker that can be found here.
Requirements: Macromedia Freehand (for EPS files)