[gfxhelp.com]

The gray color for the forum titles like "Personal Forums" is a little hard to read on the green background, The orange on green (Sub-Forums : Annoucments & Information) is also a little hard to read. Announcements is also spelled wrong. The logo is on the right, unless most users speak Hebrew or a language that reads from right to left the logo should probably be on the left side. Maybe you could put the login box in the free space of the header area or make the colored lines take up more of the white space. Last thing, if you added a border and shadow similar to this site it would help give depth to your forum.