/usr is at 90% full

Basically my /usr area  (/dev/cciss/c0d0p6) is at 90% full.   I have about 5gb currently allocated to that partition.  Fortunately, I still have about 30gb of unallocated space on the device where /usr resides.  That being said, I would like to allocate an additional 5gb to /usr.   Does anyone know the best approach to do this? 

Disk /dev/cciss/c0d0: 73.3 GB, 73372631040 bytes

255 heads, 63 sectors/track, 8920 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

           Device Boot      Start         End      Blocks   Id  System

/dev/cciss/c0d0p1   *           1          13      104391   83  Linux

/dev/cciss/c0d0p2              14         650     5116702+  83  Linux

/dev/cciss/c0d0p3             651        2435    14338012+  82  Linux swap / Solaris

/dev/cciss/c0d0p4            2436        8920    52090762+   5  Extended

/dev/cciss/c0d0p5            2436        3455     8193118+  83  Linux

/dev/cciss/c0d0p6            3456        4092     5116671   83  Linux

/dev/cciss/c0d0p7            4093        4729     5116671   83  Linux

/dev/cciss/c0d0p8            4730        5239     4096543+  83  Linux