Alex's notebook entry: Oct 16, 2010

Hello there! These days I was realizing the importance of participate in italki, in some days I´ll be ready to conversate by skype. Tell me if you want to practice we can meet in skype!

I'd write it this way:

Hello there!  Recently (or: these days) I have realized the importance of participating in italki.  In a few days I'll be ready to converse (more commonly:  to chat) by Skype.  Tell me if you want to practice so that we can meet on Skype.

We use the Present Perfect to say that an action happened at an unspecified time before now.

Here is a grammatical explanation of the distinction between the -ing form of a verb and the infinitive.

Both gerunds (nouns made from verbs by adding -ing)  and infinitives can be used as the subject or the complement of a sentence. However, as subjects or complements, gerunds usually sound more like normal, spoken English, whereas infinitives sound more abstract. In the following sentences, gerunds sound more natural and would be more common in everyday English. Infinitives emphasize the possibility or potential for something and sound more philosophical. If this sounds confusing, just remember that 90% of the time, you will use a gerund as the subject or complement of a sentence.

Alex's notebook entry: Oct 16, 2010

Hello there! These days Lately,  I was have been realizing the importance of participate participating in italki, in some days soon I´ll be ready to conversate by skype. Tell me if you want to practice we can meet in skype!
  I hope that you don't mind my corrections. I understood you perfectly, it's just a matter of how it is said.