Two unannounced HTC Android prototypes have shown up in the wild, after reportedly being sold on Craigslist.  Believed by Cellpassion to be the HTC Paradise - a sliding QWERTY version of the HTC Aria - and the HTC Fiesta, the Paradise at least had been spotted in an HTC user profile back in January. Full specs for the two handsets are unknown, but the Paradise is believed to fall in line with the Aria - a 3.2-inch display, UMTS/HSPA, WiFi and a 5-megapixel camera - only with the addition of the sliding 'board.  The Fiesta, meanwhile, has a confirmed 3.2-megapixel camera but otherwise we're entirely in the dark.  Previous rumors had suggested that the handset - believed to be headed to AT&T - had been axed, so it's not clear whether this is a sign those rumors were premature or that this is an abandoned prototype. [Thanks Baz!]