Thanks! downloading. Where is exactly the folder where I should place this file?
Copy the bootstrap.dat file and paste it in, %APPDATA%\Bitcoin (Windows), ~/.bitcoin/ (Linux) or ~/Library/Application Support/Bitcoin/ (Mac) .
Also, Armory says i'm in 254069 block, where can I see whats the total number of blocks at this moment?
You can see it on http://www.bitcoinwatch.com/ ( have other details) or https://blockchain.info/charts (recommended) or http://blockexplorer.com/q/getblockcount (shows the block count only).
~~MZ~~