Check out a free add-on for Blender called TexTools.
TexTools is a free addon for Blender with a collection of UV and Texture related tools. Back in 2009 I released the Original TexTools for 3dsMax. Currently this is an early development release and more features will be added in the future. Most of the tools are context sensitive or perform 2 actions at once.
| Align Edge | Aligns the UV island to the current UV edge selection |
| Rotate 90 | Rotate the UV island 90 degrees and align to previous bounds |
| Align Verts/Faces | Align selected edges/ verts to the bound’s direction. Or align UV islands in face mode to the bounds direction. |
| Sort H/V | Align, sort and line up UV islands horizontal or vertical in one action. |
| Iron Faces | Unwraps selected viewpoert faces Face mode into a single UV island. This is often a quicker approach of unwrapping as opposed to marking the boundary edges (mark seams). |
| Select similar | Selects similar UV islands based on the UV island input selection and matching UV Island topology. |
| Select Overlap | Collects all UV islands that overlap each other and select of each group all except for one island. |
| Select Island Bounds | Selects the edge bounds of all UV Islands in the 3D viewport. |
| Checker Map | Assigns a checker map to the selected object or cycles through 2 checker maps. When a checker map is assigned it changes the view to texture mode. |
| Reload Textures | Reload all textures in the current blend file |
You can find details on the installation process and some instructions here.