In OpenBSD 4.5 and newer, systat offers PF-relevant views, eg systat states
3 users Load 1.42 1.37 1.33 (1-8 of 177) Wed Feb 17 14:22:12 2010 PR D SRC DEST STATE AGE EXP PKTS BYTES RATE PEAK AVG RU GW tcp I 192.168.103.254:6525 88.87.60.159:5222 4:4 5415m 86395 39351 6655K 0 126 20 * tcp O 213.187.179.198:6525 88.87.60.159:5222 4:4 5415m 86395 39351 6655K 0 126 20 * 192.168.103.254:6525 tcp I 192.168.103.254:5840 88.87.57.57:22 4:4 4236m 86190 100K 52M 0 0 217 * tcp O 213.187.179.198:5840 88.87.57.57:22 4:4 4236m 86190 100K 52M 0 0 217 * 192.168.103.254:5840 tcp I 192.168.103.254:5261 213.187.179.198:22 4:4 4234m 85385 2972 956K 0 0 3 * tcp I 10.168.103.15:35303 213.187.179.198:22 4:4 4147m 86353 26488 5269K 0 0 21 * tcp I 10.168.103.15:9506 66.225.225.225:6667 4:4 3975m 86395 25552 2207K 0 72 9 * tcp O 213.187.179.198:9506 66.225.225.225:6667 4:4 3975m 86395 25552 2207K 0 72 9 * 10.168.103.15:9506
similar functionality in pftop is available via packages