Interesting list, including some sites of which I was not aware.
But how could you miss
http://www.ssnet.org? Bible Study Guides are online, wich ability to click on your preferred Bible version. There is an associated email forum. This has been online longer than any of the sites you mentioned, except the
http://www.whiteestate.org/Then there is the very oldest SDA forum on the internet:
http://www.sdanet.org. It's not always a friendly place for conservative Adventists, but it includes some very valuable discussion. In current discussions, look particularly for contributions by Leroy Moore. The AtIssue sub-directory has some valuable material, including whole books:
http://www.sdanet.org/atissueAn
excellent site to counter all the negative sites about Elle White on the internet:
http://www.ellengwhite.info/There are others that don't impress me nearly as much, and here's one that claims to be the largest defense of Ellen White on the internet:
http://www.ellenwhitedefend.com/ (I haven't really checked this one out thoroughly.)
Another site that looks good in support of Ellen White is the one by Jud Lake:
http://ellenwhiteanswers.org/