Blog posts not getting indexed anymore

Thanks for all the advice, I think I might have been a bit to vague in my post. I got so many great answers I will qote some of them to be sure I answered you all.

Thank you for the motivator. You are right, a couple of weeks is nothing, I guess you get spoiled when your system been running smoothly for some time.

Hi Suzanne, I use wordpress on my own server and are pinging a bunch of services that I fond useful. I always do keyword search before my posts and are aiming for long tail keywords. I write my own content always, no duplicate at all.
As far as social bookmarking goes I use it for backlinks, because the converting I get from social sites is not very great. The best converting traffic comes from the organic one. So I bookmark every now and then, but not nearly every post, I seems better to put my efforts elsewhere.
I also found that if I write an interesting post or offer something for free I get a lot of backlinks from that, so that´s another reason to concentrate on the blog more. I write to article directories every now and then if there´s a reason, but the same thing there; my writings seem to do most use on the blog itself.

I write in niche related forums from time to time to get a traffic boost from there. Works if you are active and have a good offer your sig.

I use no black hat what so ever, no duplicate content, sold or bought links, I am working to follow googles guidelines, I actively follow what's debated in the google webmaster forum and read Matt Cutts blog (a google employee for for those who don´t know) regularly. It´s a totally basic concept, quality content mixed with affiliate and adsense, after trying all sorts of things, this is what pays off for me.

I use webmaster tools to its fullest, among other things I use it to follow how google is searching my site. It was there I found the errors in the indexing. As the sitemap goes, I told a bot about the trouble I had in my original post and the thing is that it was totally not loading plus there was a couple of broken links, so I changed page slugs/titles. One of my other sites just dropped totally once when I changed titles lugs and after some research I found that it´s quite common to get dropped for fundamental changes like that. So, I thought this might be the case, but maybe to a lesser degree in this case. Anyhow, as far as that other blog goes, I filed a request of reconsideration to google and the thing was solved within a week.

So back to my original question, when it comes to getting indexed in the serps, have you ever experienced such a thing, from getting indexed very fast with your posts, to not getting indexed at all? In my case, my old blog posts is still doing well and my keyword positions remain the same. Did you get back after a while and in that case how, if the new ones got indexed again all of a sudden, what happened to the ones in between, did they get indexed finally too, or did the stay out of the serps?
appreciate any feedback.
thanks,

Are people starting to link to your blog? Hopefully your content attracts other Bloggers to link to you but even big sites are actively building links so should you.

Has your PR dropped? Is your blog being spidered as frequently as before?

excellent, that´s very good to know. Helpful for many others here as well, I´m sure.

Yeah, freaking out has been my middle name this last couple of weeks . I´ve been keeping on writing during this time, but it´s been really hard do concentrate, with this drop hanging over me. It was like I finally found something that worked, things started to go smoothly and it was working with the thing that I enjoyed none the less: by writing and then some more writing. I feel SO much better now! Hard work might pay off after all.

By the way some wise person wrote this in some forum, can´t remember his or hers name but it was this formula for a successful blog: 70% working on the blog, 20% backlinking, 10% SEO. That´s a good way to spend your day, I think.

Thank you so much for your tips and encouraging words! I will keep on working with so much more ease now. I will let you know how it goes.

all the best,

Haven´t tried that, I will look in to it, thanks,