Your fingers are the key to using the iPhone and iPod touch, so how can you enjoy these devices in the sort of cold weather that requires hand protection? Less expensive than the original model D120, Dots Gloves' model D105 ($15) and D110 ($20) offer solutions in the form of acrylic yarn gloves with special fingertips that permit three fingers per hand to interact with the big icons on either device. The thinner D105 and thicker D110 are both straightforward,…