To make things clear for people reading this thread, and to minimize questions up to this point, this is where we all stand:

Without the SDHC hack mentioned in this very thread, no SDHC cards will even be recognized by the device.

With the SDHC hack:
4GB SDHC MicroSD will be read perfectly, without any problems.
6GB SDHC MicroSD cards will only read approximately 1.7GB of space.
8GB SDHC MicroSD cards are still unconfirmed, I believe.

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I should also note, regarding the sync'ing of music, that I have had problems where my library would disappear on the card after updating/resync'ing the library. To resolve this, I simply deleted all the contents in my "music" folder on the card, and then re-sync'ed and it appeared again. This has been the only issue I've experienced with the SDHC hack not working.

I am still standing by for a new fix to all of our SDHC 6/8 GB woes.

One thing I haven't tried is filling the card past 1.7GB and seeing if the phone can still read it. Just because it says thats all the data you have, doesn't mean a Windows PC can't load a bit more on there. It would be something useful to at least try. If this works, you may not be able to install more programs onto the card or store photos/messages, but at least all of your music/video/pictures will be there. Might hold you over until a new hack is released/developed.

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You lock it up..