When I wanted to switch to the new type of packages I asked if I could keep my static IP and I have,
It's my understanding that existing NewNet users with a static IP were not changed onto dynamic as part of a "regrade" (I guess it would also be extra administrative work). I can't promise that is still the case though!
Whether it is any advantage depends how you use your connection. At its simplest if there is anything (or a particular service) that is always on at home that you might want to have access to remotely a static public IP is useful (even if that is just access to your router). For some people that would be a (network attached) storage drive or perhaps a webcam.
Another example is if you are providing remote computer assistance to friends and family from home, having a static IP makes it easier to setup their firewalls to allow you in, or for their computer to make a reverse connection back to you, for VNC or screen sharing.
Similar applies for working from home as it provides something extra
the office firewall can check before it lets you in whether for VPN or just a remote desktop session (for the latter it would know what computer to forward you onto).
prompt $P - Invalid drive specification - Abort, Retry, Fail? $G
prlzx on n e w n e t: ADSL2+ / 21CN at 2.5Mbps / 800k