[LCP]Projects using data structures

[Sabu Thaliyath]

Hi All,

 I am a data structure newbie. Though I have learnt the data structures like 
Trees , B-Trees etc, I have no idea about how they are used in application 
softwares (I know that buffer cache in linux uses doubly linked list).What I 
am looking for is some application program(not system programs) with any such 
data structure used. Can anybody  provide me with  some links to such 
applications (searching sourceforge and freshmeat didnt help)?

thanks in advance,
Sabu Thaliyath