I have successfully tethered my Eris using PDAnet for 2.4mb/s connection. Works great and its fast.
Got speedtest.net score of 1.38mb/s down and .76mb/s up. Pretty decent for my area (NYC)
Please dont post about Verizons terms and conditions. They dont care if you tether as long as you dont go crazy and download like 10gb/month. Yes I used to work for Verizon in the NRB (Network Repair bureau).