I also found the multiple tests of font rendering to be a good idea because it shows why the archive exists. This archive is intended less to show of features to readers as it is to give developers a set of demo files to test their rendering engine. This archive saves developers the effort of writing their own test files, and as a corollary it increases the likely hood that the all the requirements of the spec will be implemented by the developer.
And that last part is important; I have a couple different ereaders in my collection which don't support all the parts of the current Epub spec. I'd really like to see that kind of sloppyness end.
You can find the files here. You'll need either Readium, Azardi, and the latest version of iBooks to see the features. I'd go with Readium, even though it requires Chrome. I already noticed that iBooks doesn't support at least one of the new features.