Mark
I'll try to stick to the ones that I can remember that have something (or things) really interesting going on....
Brora #8--blind drive that you know you have to hit long to be able to get on in two, 2nd shot that if you can get on in two must be carved in from the left to skirt a hugh mound, hugh chasm short right of the green which means if you try to get on in two and fail, you have a veritble mountain to climb if you want to get on or near the green in 3, "bottle" fairway to the left of the hole which means that in any lay up in that direction you need to balance the reward of greater distance with the risk of finding the rough (or a nasty little left bunker).
Dornoch #12--miles of room right off the tee, obvious tiger-line to the left. Hit it right and you have a straight but very long shot to the green, probably requiring a layup. Hit it a few yards to the left of line A and you are in humpy rough which requires a blind layup. Hit it straight and you have a shot to the green which (if you are long) requires a cut mid-long iron to reach and hold the green, and if you are short requires a sling hook with a wood between the right hand bunker and the 15 foot hump guarding the left (land slopes hard from left to right, against the normal geomorphology). Big green with a lot of subtle breaks.
Old Course #4--long for us (although not for the pros), but featuring a 50-100 yard blind depression befoere the green that one must run through to reach the putting surface. If this had ben built in the US in 2009 the depression would have been a pond and the 100 yard long green would have normally been pinned at the back rather than at the front.
New Course #4--a visible fairway with a lot of pitch and roll, then a shot towards a green tucked in a hollow behind two mounds bisected by a 10-15 yards opening. As originally designed by OTM those two mounds were part of a continuous ridge, but the ridge was bisected by later power that were. Same thing happened at Littlestone's 1st. For anothe similar hole see the excelent 4th (?) Glasgow Gailes.
North Berwick #11--other than a great green, #9 at NB has not much to offer. #11 has it all--demanding tee shot, rish return 2nd, great green site. A hole that I could play every day and not get tired of it.
Troon #16--two forced carries at a critical part of the round. Could be a 3, could be a 7. Love it!
Cruden Bay #6--how can you not love a hole that the pompous arse Tom Simpson cited as one of his favourites when he didn't even design the green!? Old Tom Morris and Archie Simpson did that, and T. Simpson improved the hole by making it a par-5, but the genius that is there is on the green, protected by its fascinating rolls and the "Bluidy Burn" which wraps around it.
Royal Aberdeen #2--takes you out into as good a 9 holes of linksland which exists. After teeing of on the first in front (within 10 feet) of the members lounge, getting out into the heart of the course is nirvana.
Lundin Golf Club #9--by far the best of Braid's holes on the course (1909). A drive you know you need to hit down the right with a draw to get maximum distance, but with magnificent houses just to the left and OB of that line it is too easy to bail out left and have no chance at the green. The 2nd/3rd shot is to a green in a hollow with sharp slopes front to back and right to left. You should be near or on this green in two, but 6's a 7's are easily made, even by the good players.
Torrance Course #18--I include this hole not only because I finished my latest round of golf here with a birdie on Monday, but also because I think that the designers have created a great finish which shows why water can be an interesting feature even on a golf course so near the home of golf. Working gradually uphill, you need a very strong drive to even think of reaching the geeen, but if you do hit it far, the burn 50 yards of so in front of the green forces you to think about what you really want to do. If the burn were not there, it would be only a two-whacks-as-hard-aws-you-can kind of hole, but the burn makes you think. As the green is long and contoured, if you lay up, you need to be very careful on the 3rd shot, or a 6 is a distinct possibility. It is not a particulalry "Scottish" sort of hole, but it is well designed, and standing on the green (or more enjoyablly, in the clubhouse) overlooking the Burgh of St. Andrews to the north, is one of the finer moments in golf.