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It's a fair bet that sites linked from highly reputable sources, such as the BBC or online newspapers are worth reviewing. However, most commonly I still utilise the Google search function typically with a multiple word phrase and will often drill down ten pages or more to find quality content on unoptimised sites.
For the regional categories edit, I keep my eyes open: URLs in shop windows, sides of trucks, ads in local papers, etc. I occassionally look through the town council's sites, Chamber of Commerce etc. But they are usually way behind -- I think they are mining DMOZ.
My #1 recommendation for getting an unsolicited review from the ODP is "make sure your site doesn't look ANYTHING like an affiliate farm at ALL"... if it's sitting in unreviewed I'll take a careful look at it before junking it as an affiliate, but if I'm surfing for sites myself, I don't even bother taking a second look at anything that looks suspicious.
In the same vein, my #2 recommendation would be "make sure the original content is RIGHT THERE and REALLY OBVIOUS from the VERY FIRST PAGE ON." If a page I surf to hasn't got any serious content on it, I'm unlikely to go digging around all the site's other pages looking for some.
Look out for sites that don't work with certain browsers or have an unskippable Flash intro, too.
My guess is that these things would help reel in *any* surfers, not just ODP editors, and would therefore be time well spent anyway...
In my experience, quality sites have titles like:
Bob's furniture store - for all your furniture needs in Chicago
and not
Bob's furniture store, the best in the world, chairs, tables, wooden sideboards, beds, double beds, single beds, bookcases, shelves, pine shelving
so when browsing through Google results, I tend to bypass the second type. Overhype and keyword stuffing almost invariably means more hype, less substance.
NB so remember that too when you're writing your dmoz submission. It's in the guidelines for a reason...
Also, if your site has more than one language version, be sure that the links to the other versions are proprely displayed and visible, possibly in the homepage. Several category editors do send [other] language versions of a site in the proper World/ categories, and several editall+ editors tend to do the same, or directly list the site in the proper World/[something]/ categories if they speak the language.