Probably when submitting you should say "I had this on my blog for two weeks" or however long it was.
Not like posting something on a blog. SYW is password protected, so it doesn't get index in Google or other search engines. It takes enough extra effort for some 'flyby' surfer to to read something in SYW (they have to find the page with the SYW password, then go into that forum and read your work), that it's not considered published (you could legitimately sell "first electronic rights" of something posted in SYW to an online publisher).
It's looking good that the vodka is running out?
A lot of magazines accept reprints, but pay at a different rate and ask that the cover letter specifies where the piece was published, which is especially where ben's advice comes in handy. Remember, that even if you've deleted something from your blog technically it has still been published--much like you can sell a story to an ezine and after the contracted period ask them to remove it from their archives, but even though no record will exist any longer of it having been published by that mag, it still has been. Of course, everybody has their own ethical and moral standpoint as t0 whether they would delete something from a blog and sub it as brand new.
