Free sites and galleries tend to be "quick result" things. Provided you follow the rules and build reasonable sites, you can get traffic to these sites quickly and easily enough from link sites and TGPs.
Blogs are much slower, tend to have much lower traffic levels, but providing you are making a fairly focused blog with some good content and links, you can make some decent moves with them.
I am currently tending a couple of smaller blogs, but I have already seen sales off of both of them which I am enjoying. Provided you keep your blog up to date and happening (not an easy job) you can start to attract bookmarkers, external (unprompted) links, and blog trades that can drive your very niched traffic right up there.
I will say this: Unless you are truly dedicated and are able to track down sites / galleries / links / things and are able to write decently, blogs may be a losing battle for you. You can find tens of thousands of derelict blogs with less than 10 posts on them, gathering dust and doing nothing.
I will also say that unless you are willing to put a little effort into making your blog look at least passibly unique and interesting, people will blow over it and the magic won't happen either. Default themes and flat text just doesn't do it, from what I have seen.
Alex
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