use the following access-list it will block msn chat, icq, aol chat
access-list inside deny tcp any any eq 47624
access-list inside deny tcp any any range 2300 2400
access-list inside deny udp any any range 2300 2400
access-list inside deny tcp any any eq 1863
access-list inside deny tcp any any eq 799
access-list inside deny tcp any any eq 666
access-list inside deny tcp any any eq 554
access-list inside deny udp any any range 1417 1420
access-list inside deny tcp any any eq 1024
access-list inside deny tcp any any eq 1503
access-list inside deny tcp any any eq 135
access-list inside deny tcp any any eq 1755
access-list inside deny udp any any eq 1755
access-list inside deny udp any any range 2000 2003
access-list inside deny tcp any any range 8000 9000
access-list inside deny tcp any any range 6112 6119
access-list inside deny udp any any range 6112 6119
access-list inside deny tcp any any range 2000 2003
access-list inside deny tcp any any eq 4020
access-list inside deny udp any any eq 4020
access-list inside deny tcp any any eq 4747
access-list inside deny tcp any any eq 4748
access-list inside deny tcp any any eq 10090
access-list inside deny udp any any eq 6144
access-list inside deny tcp any any eq 5050
access-list inside deny udp any any eq 5050
access-list inside deny tcp any any eq aol
access-list inside deny udp any any eq 5190
access-list inside deny tcp any any range aol 5193
access-list inside deny udp any any range 5190 5193
access-list inside deny tcp any any eq pcanywhere-data
access-list inside deny udp any any eq pcanywhere-status
access-list inside deny tcp any any range 6665 6669
access-list inside deny tcp any any eq 11999
access-list inside deny tcp any any eq 18888
access-list inside deny tcp any any range 28800 29000
access-list inside deny udp any any range 28800 29000
access-list inside deny tcp any any range 9992 9997
access-list inside deny udp any any range 9992 9997
access-list inside deny udp any any range 8000 9000
