saman33,
I dont believe that they are putting any caps on the newsgroups, as I have gotten over 14mbs down on them (this was during the week) on the weekends I seem to avg 3-6 mbs. What OS are you using? Have you used any of the tweaks on this site? I copied Halo's settings. I use newsbin which program are you using? Have you tried a tracert to the verizon newsgroup servers?
heres mine
tracert news.veriozn.net
Tracing route to news.veriozn.net [64.20.33.2]
over a maximum of 30 hops: