Lots of folks are curious about replacement windows. The current trend is -- of course -- vinyl windows... which would look out-of-place on an Eichler home. While the energy lost through the transmission of the aluminum (over vinyl) is an issue, since we live in a mild climate, it was a worthwhile trade-off (efficiency for not cringing each time we look at the windows).
We purchased Milgard's basic clear anodized aluminum replacement windows. Ordering without a nail fin enabled us to slip them in after we slipped the originals out -- a very easy process if the measuring is done correctly (some of ours were a bit tight and I had to shave off some wood for a good fit which was no fun... measure twice, cut once).
Anyway, I pulled out the DSLR today and took some up-close/macro shots so folks could see the fit and finish. So far, we've installed three of the six: two bath windows and one bedroom window. The hall-bath and corner bedroom share a sill... it was a task to recreate such a long piece.
Some things to note:
... We have not done the final cleaning. The units come with quite a bit of goo on them (excess caulking) which traps sawdust. Some denatured alcohol will probably help to clean them (see red circle in 3rd image).
... We also replaced all of the redwood trim: Sills (which were both daunting and satisfying to make), trim, etc.... still final sanding and painting to do.
... The windows open easily via the Milgard-branded latch as well as lock (the brass button)
... Unfortunately, Millgard won't/can't make the original 2-pane windows... likely due to safety issues. We had them make 3 individual, but equally sized panes -- the 2 sides slide open.
... The windows are held in place by 3/4in square redwood stock and a bit of caulk -- simple simon.
... The gray "paint" is primer. We got smart and had them tint the 2nd bucket.
... Still lots of sanding and finish work still to do.
... The windows are double pane + low-e, but not argon filled. The bath windows are frosted and tempered.
... All 6 windows (4 bedroom and 2 bath) were $1500 from Home Depot.
... We'll be installing all of them ourselves as we replace the siding around them.
Edit: As of October 2009, we've not had a problem with condensation save on the inside of the bath window frame after a hot shower (which is to be expected). The plastic trim (it's minimal trim) on one of the most sun-kissed windows is fading a bit (from gray to tan), but not a huge deal overall.