The title says everything. Do you have any “real-world” experience with ggbit NICs + VLAN ?
P.S. @ Mikrotik, will we see good support for 8169, this is very cheep ggbit card and in some countries it is the only ggbit card for price under 100 $ 
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Try an ebay search for the Compaq / HP Gig server adapters.
They VLAN and work GREAT under RouterOS.
Craig