Though it is important to keep up the posting on your blog in a regular pace but I find that it is not at all necessary to be posting twice a day or even everyday.
Though this is a delicate topic and some may argue that the most successful blogs have many posts coming up in a day, I feel that it is a matter of your convenience and the target audience.If your blog is about blogging tips then it makes sense to post daily because the readers will be very active online and may visit your blog even several times a day, but if you blog about your holiday adventures then I don't see the urgency to post everyday.
Regular readers of this blog might know that I keep up posts roughly around 2 days apart because I simply don't feel like writing everyday and also quality suffers if I force myself to write something just to make up for that day. But I also make it a point that two posts are not very apart. Long absence from posting may make your readers feel that you are disinterested and you can lose loyal readers.(there are always a few)
So guys , the bottom line is QUALITY and also your interest.If you don't feel like posting today,just don't do it! I see several blogs where the posts are simply written to cover some space. I never visit those blogs again!
What do you do? Do you post everyday?