There is a slight difference between these two phrases. The "Скажите мне пожалуйста" a bit of excessive(redaurant). It is correct but it has an double meaning. "Ну и скажите мне пожалуйста кто же тогда в этом виноват?!" - it kind of irony. About the second phrase i can say nothing. I dont know how often it is used in ordinary speech. I only say that when i need something to ask from non-know person i say something like this "Простие, вы не подскажите который час?", "Простите, вы не знаете как пройти в библиотеку?" - i use "Простите" like you, perhaps, use "excuse me" or "sorry"( i prefer to translate "sorry" like "Извините" and "excuse me" like "простите")

Я мало общаюсь с людьми в реальности( да и в интернете по сути не с кем ), читаю в основном на английском. Даже в моей ситуации язык начинает забываться.

Предпочитаю прохладу. В жару работоспособность падает.

This is kind of swearword, and also kind of slangy anatomic term. I recommend not to use it anyway, this is very strong word( like three-letter word and others). If you still intrested in this term you can read some info here: (its just an article, fortunatly no illustrations are provided :) but if your not 18 i recommend not to read it, it containts strong language) http://ru.wiktionary.org/wiki/%D0%B7%D0%B0%D0%BB%D1%83%D0%BF%D0%B0

Asya said almostly correct(as i think, i maybe mistaken) translation but i think this can be translated as "Not so long ago". "Недавно" and "Не так давно" is kind of diffrent phrases. "Не так давно" is more suitable when you want to tell your friend that something wasn't made too late of much long ago. I cannot explain this by words so i just write formules of this phrase: Не так давно = давно - некоторое количество времени(a little bit/medium amount) Недавно = сейчас + немного времени(a little bit of time)

This could mean everything. It depends on context. Can you provide text where you found this abbreviation? For example if it from IT-newspaper it can mean Information Technologyes( IT means this ) Conference. But i guess the best way it this kind of situation is to simply look for this abbreviation on wikipedia: http://en.wikipedia.org/wiki/ITC

I start to improve my skills in something, or read books about something that intrested me. This helps in most cases. I just replace sense of sadness with feeling of progress in work.

Probably not. Why lie about such small things?