I have 50 or so unique articles, all for one niche site. I am using Wordpress on the site (if that helps). Now, is there any difference if I publish these posts gradually (1 or 2 a day), or publish them all at once?
ya, wordpress is different from article submission. I would suggest to 200 article submission for better result.
If you were to publish all of the articles at once, you would have a harder time to compete to rank for keywords in your niche. Releasing them on a slower basis allows you to keep up with the competition. Let's just say, you are site A and your competitor is site B. You release 10 articles on the same day. They get indexed and you notice a small boost in your SERPs. Your competitor releases 1 article per day for 10 days. Their articles are indexed and bump yours down because it's constant fresh content. Google responds better to newly updated content, so take your time, and do a slow release. You'll get more out of your articles that way.
I suggest you to post daily 2 articles and optimize articles for search engine. You spend some time to promote your blog - social bookmarking site, comments, forum posting etc... In one month, all your 50 articles published and your blog also get good rankings.
hello no it does not need to publish your all article at once. you can publish it on a weekly basis or of you want fast you can choose regualar