Just purchased Patriot 4GB Class 6 SDHC card from Newgg.com. Loaded the card with photos & MP3's using my card reader on my desktop computer. Then inserted card in my XV6700 running WM6 VerizonGuy's Dev. 4. Did a soft reset. Works perfectly! Shows 3894.00MB total.
Here is the link to the SDHC card. Only $36.95!
http://www.newegg.com/Product/Produc...82E16820220260.