I make no guarantees that any of these will collapse or be a good investment... but I'm posting them here for your reference, and will list my thoughts on these...
STTS Investment Fund - I think this is a good deal and actually invested myself. Currently though, Josh is still working out the details on how to pay investors... Originally he was going to do a 1% weekly payout, but is currently revising that setup while trying to protect the ped value of all investments so that he doesn't cause the fund to cause itself to go broke. (accumulated 1% weekly interests over the course of year would grow substantially fast, probably faster than the fund could afford to make up for in profits, so he will likely go to a percentage of profits model soon)
EFD Growth Fund - this is a pretty safe bet as long as efd is still accepted and is traded for peds on occassion.
DWIF aka (Society: First Realm in Entropia Universe) is another up and coming fund, but it's not public yet. Like Anshe Bank (which failed) it plans to use a cross-virtual world model that will incorporate both Entropia and Second Life among others.
DWIF could be in trouble unless they get some things sorted out...
http://www.associatedcontent.com/article/1324612/travis_ristow_resp...
Entropia Investment Fund - This has potential to be a failure if the TT=0 items (a couple of LAs, a Hanger, and a Mall Shop) that it owns drop in market value markup to a point below the price that was paid for them. It is a LONG term investment since many peds were sunk in to TT=0 items with very high ped value that the fund has no plans on selling anytime soon.
R&R Fund NOTE - CURRENTLY IT APPEARS THAT R&R fund was likely a scam!
Sparhawke has mentioned that he would like to start a U.B.E.R. fund that works with stackables purchased at 100% prices off of auctions. If he gets that going, I think it will possibly be a good buy...