One of the people I follow on twitter sometimes ends his sentences in ぞと. Is
this just a more polite form of ぞ？

Here's an example:

> ブログUPしましたぞと♪(´ε｀ )
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2011-07-30T12:55:19.290
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2011-12-29T06:05:13.923
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usage particles register
Ending a sentence in ぞと
I would split the example sentence into two parts:

> ブログUPしましたぞ / と

Unfortunately, I cannot explain how the と affects the other part well, but as
far as I can say as a Japanese, the と is a kind of like an interjection and
its effect is vanishingly small, at least not making the sentence more polite.

FYI,
[Reno](http://en.wikipedia.org/wiki/Characters_of_the_Final_Fantasy_VII_series#Reno),
a Final Fantasy 7 character, often ends his words with `〜ぞ、と。` or `〜だぞ、と。` the
same way as the example. The person may perhaps just imitate this habit.
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2011-07-31T05:39:42.560
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The only thing I can think of (without any context provided) is that this
would be used when quoting what someone else said. Like:

> 彼は心斎橋へ行くぞと言った 【He said "Let's go to Shinsaibashi"】 → Making known that he
> said something, and what it was.  
>
>
> みんなでどうしたらいいかについて彼は意見を言った。心斎橋へ行くぞと 【He gave his opinion about what we should
> all do together. "Let's all go to Shinsaibashi!"】 → The fact that he said
> something was previously known. Now it's being made known what he said.
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2011-07-31T05:42:33.923
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This `ぞと` should be broken down into two particles:

  * `...ぞ`: reinforces and reminds one's decision or will to oneself 
    * ex. さあ、やるぞ。Here I go.
  * `...と`: light declaration 
    * ex. いつか行こうっと。I'll visit there one day.

So your example roughly means, "There, I've posted a new blog article." And
no, it doesn't add any politeness to the sentence.

The same `と` is discussed in [this
board](https://web.archive.org/web/20110602195339/http://nihongo-
online.jp/bbs/discuss.cgi?id=20&mode=part&page=0&num=2401&sort=1&back=tree)
(Japanese), which cites 明鏡国語辞典 {めいきょうこくごじてん} (Meikyo Japanese Dictionary):

> （「・・・っと」の形で）軽く言い放つのに使う。 (In the form of ...っと) used to declare something
> lightly.

The preceding sentence is usually in volitional form, like ` もう寝ようっと`. Or, as
in the case of ...ぞ, expresses volition in some other way.

Note: depending on the context, there are cases that ぞと should be parsed as
「...ぞ」と, as explained in istrasci's answer.
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