hie all,

i am very new to linux os and ubuntu, i just installed it very first time and i find linux is cool..
bt now i m facing a problem of disk space.
i have setup dual boot ( vista / ubuntu ) , and at the time when i created partition for linux i thought , i will not keep this system for long time and also i will not install much in it so i kept partition size less. but now problem is that i just fall in love with linux so i want to keep it for ever , bt again my disk space is limiting me from installing stuffs.
i want to know that how can i increase partition size of ubuntu , problem is i also have another OS (vista) and i don't want to lose any data from it too , so i guess it must be little tricky to increase size.
can i resize my windows partition and then just add it to ubuntu ? if so , then what is the procedure ?
please help me out .....
and yah.. i m very green in ubuntu and linux so please please make it little descriptive .....