The Lockman hole?
http://en.wikipedia.org/wiki/Lockman_Hole
It has a column density of neutral hydrogen of $6times10^{19}$ cm$^{-2}$, which will correspond to very little dust.
Two others I've heard of towards the Galactic bulge are known as the Sgr I and Sgr II windows.
Finally, I offer "Stanek's window" towards the bulge, which has been referred to in a number of the Chandra Galactic plane X-ray surveys but appears to have no refereed publication associated with its discovery. I found this on arXiv. http://arxiv.org/abs/astro-ph/9802307 It is at $l=0.25$, $b=-2.15$ and has $E(B-V) sim 0.6$.
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