Time Gentlemen Please & Ben There, Dan That!
Dear Esther 1.99€
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LIMBO 2.49€
KotOR
Assassin's Creed
Dead Space
Mirror's Edge
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Crysis Warhead (already had the others - and they all have SecuROM!) 2.99€
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Duke 4 4.99€
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FO:NV uncut 9.99€

Plus another 20 games on my watchlist, half of them indies.

Almost every indie RPG or famous indie game of the last 5 years can be bought for 2-3€ in the Summer Sale. Only the new stuff costs slightly more. So if you put indies on your buy-later-list, search for them on Steam.