links for 2007-09-13 September 13, 2007 Nic Haralambous 7 Reasons Why Niche Social Media Outlets are Better Than Digg (tags: digg media social) Pixel Groovy (tags: design digg social webdesign photoshop tutorial howto graphics css tutorials aggregator community) Dumb Little Man (tags: blog blogging blogs productivity tips howto lifehack) Mango Beta Launched! (tags: language learn tutorials)