Current list of IP addresses I have banned, for scraping, using WP-ban

72.249.103.154
69.41.230.8
74.50.109.2
69.93.233.66
74.86.179.154
72.52.244.148
78.110.160.130
216.255.185.178
74.86.186.66
70.87.226.18
207.226.183.66
74.52.59.130
74.52.67.146
69.89.31.61
72.36.144.34

Most persistent scrapers are, with number of attempts:-

69.41.230.8 110
74.50.109.2 4
72.52.244.148 2
74.86.186.66 4
207.226.183.66 9
78.110.160.130 6
70.87.226.18 2
74.52.59.130 4

Thank goodness for the excellent plugins like Spam Karma and WP-Ban.

A good list of comment spammers can be found at Scott McGeriks site.