Marx's list is the only thread actively compiling ELW information on this forum. I don't think anyone is actively recording water worlds and other terraformables - there's just too darn many of them. For every ELW in the game, there are roughly 10 waterworlds and 50 terraformables.
Orvidius and others often trawl through the EDSM data, looking for oddities and patterns, or for rare one-in-a-thousand occurrences, such as Trojan ELWs or ELWs in highly eccentric orbits.
I'm tracking numbers of ELWs, terraformables and other things found in my ED7K Project, but it's a one-man survey. I'm also collating stats for every ELW I encounter, to run some statistical analysis on once I get enough data.