LogiLogi Manta is as of today also working in Internet Explorer Seven (keeping fingers crossed). Supporting IE7, together with Firefox 3, which was already supported, means that about 70% of web-surfers can now use LogiLogi without problems. Which is, well, not that bad percentage for an interesting app like this one.
We will improve the usability of LogiLogi a bit more with things like simple (non-OpenID) accounts and invites to peergroups over the coming days / weeks. Then we will do a bit more PR so you and others can actually find and enjoy it :)
In the meantime, please let us know if anything is not working as expected.