If you truly do care about the visually impared then yes, the navigation buttons are far too small, and there's no-way someone without their contact lenses in could see them!
But the main font and text is fine on the background - good contrast. Although HCI heads would tell you that a bright background and darker text causes substantially less eye-strain. But its the content that's important to be honest. I dont know of many visually impared coders.
And I have to admit, within a fairly short space of time, I scanned your DLLs and saw a few that caught my eye - especially the SQL plugin. So you have lots of useful resources by the looks of things. Nice one.
If you'd like suggestions, I would suggest expanding the detail of said plugins, because I'd like to read just a few more sentences about them before I download them. "An Array type of Plugin" doesn't really make me want to check it out, when infact, it might have some quality functionality behind it.
Overall, nice site though.
Signature? No! Obsolete! These days it's all about chip and pin!