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Many blogs also use no-follow for their comments, but you can find many that will still follow (however even if they do, it is hard to get exact anchor text links unless your profile name is one of the keywords you are targeting...which looks very fishy)
But to answer your question, yeah, dropping spammy comments is a waste of time in my opinion.
The no-follow implementation combined with the use of social media sites has completely changed the use of links on the web. Before, if you wrote something interesting, you'd get a load of links from blogs and would benefit from all the lovely link juice. Now you get a load of tweets instead of blog posts and half the blogs you do get will be no follow.
Google will have to take this into account. The internet is used differently now to when they first invented no-follow and if they don't then a lot of good quality content won't be recognised with high rankings.
How they will decide a trust worthy no-follow link over a spammy one will be the hard part.
I think that no-follow links will be counted in the future,
Google have made other changes that mean that you can no longer use nofollow for PR sculpting, therefore any nofollow that is now encountered must be interpreted as meaning what it says.
It's difficult to say really. Even powerful sites have no-follow, and if half the sites on the web decided to apply no-follow in a few years' time, then Google will find it difficult to rank websites 'Gmorgan' does have a good point.
If you are actively participating as a member of a blog's community, and have useful and insightful comments to add, then you may be able to build up relationships with others who are followers of that blog. They, as well as the owner of the blog, may put your blog or website in their blogroll.
If you are posting crap then don't expect anything. The links themselves aren't the point.
There has been a considerable amount of evidence that Google does follow them and they do provide some amount of benefit.
No benefit. Not even for discovery. As for the link value itself, the link value doesn't get folded into the link graph [webmasterworld.com]. There is no evidence, much less considerable evidence, that there is a benefit.
Some people elsewhere are confused because they discovered that the link shows up as a backlink in WMT. Do not let them confuse you. They do not understand that Google backlink searches and WMT are not SEO tools. The data Google provides is and always has consisted of random samples. The data is not accurate for SEO purposes. It's random. This is by design, it has always been this way. It is a well known fact.