I screwed up and deleted a thread started by Carlos, and updated by Max.
My apologies go out to both!

new update: 2008-03-15 19:00 GMT

NPLB LLRnet server #1:
maintained by Carlos Eduardo
server = "crus.dynip.telepac.pt"
port = 300
current range: 401 <= k <= 1001, n = ~ 376.0k (upto 378.0k ~22,500 pairs)

NPLB LLRnet server #2:
maintained by IronBits
server = "llrnet.ironbits.net" NEW SERVER ADDRESS !
port = 5000
current range: 301 <= k <= 399, n = ~ 397.4k (upto 400k ~6,000 pairs, then 440k-460k ~35,000 pairs)
Report: http://llrnet.ironbits.net/index.shtml

NPLB LLRnet server #3:
maintained by Adam Sutton (AES)
server = "nplb.rieselprime.org"
port = 300
current range: 401 <= k <= 1001, n = ~ 396.0k (upto 400k ~ 46,000 pairs)
Stats: http://nplb.rieselprime.org/stats/stats.php?a=reset

Note:
- n > 333k is Top5000 range

Updated server information can be found here:
http://www.mersenneforum.org/showthread.php?t=10042