As a HTML/ Css programmer which I do part time, I get lots of requests of making different types of menus and navigation, a certain type of drop down to be done or rounded edged columns using css and divs.Getting a request is one thing creating it is another thing.
The first thing I usually do when I get such request is head to Google and DynamicDrive to see if there is a existing script which I can modify.
As I am a Software Engineer by profession, the rule of thumb for me is use anything thats reusable rather than starting from scratch. Following this helps me save a huge amount of time getting things done.
Ok getting to point I found this cool resource from Tutorial Blog which has a 25 ready to use code snippets for web designers to save time. Its an extensive list and contains snippets for showing bubble tool tips, showing tooltips on hovering, ajax star rating system which allows you to rate for a topic without refreshing the page and many more useful things.