A new ROM has reached a stable state over the Christmas break which is address compatible with the old ROM. This means that it will run most Spectrum games and since it has letter-by-letter keyword entry, it is great for typing in those magazine listings.
Another bonus is that the default NMI function is to perform a Warm Reset even while you are playing Manic Miner etc.
Most of the old quirks like PRINT INT(.5+.5) are gone.
Best of all it has a Renumber and Block Delete and a Stream Lister.
You can try the ROM online at
http://www.wearmouth.demon.co.uk/gw03/gw03.htm
and you can download the ROM and study the Assembly Listing from that page too.
This is particularly good in emulators if you have trouble remembering the key combinations.