I'm working on a simple TGA loader which can import 24 and 32Bit RGB and RLE encoded images. Additionally, for images that don't have alpha channels, I'm fiddling around with a custom alpha channel creator, which uses callback-functions for calculating custom alpha values, or being able to select an R G or B channel as your alpha channel data.

Currently only 24bit RLE and RGB encoding is supported, more to follow

You can pick it up from my website