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Both are from the More Card Manipulations Series by Hugard. Both rock. I didn't struggle with DLs all that much to begin with but these two methods are damn near fool proof. Technically one is an alternative to doing a DL but once you see it, you'll understand the potential.

From Series 3:
DL Substitute
Credited to Moore
Uses the Hindu Shuffle. Avoid Step 1 if you intend to use the Hindu Force anywhere else in your performance.

From Series 2:
The "Carlyle" Snap DL
Credited to Francis Carlyle
Uses a crimp that is cleverly put in as you are showing the spec their card. Very bold but they won't have a clue. No cover or complicated movements.

Both methods make it damn near impossible to not have the cards aligned properly. They really are idiot proof.