These help w/ daily practice doses: @arabiclanguage (this is the account for BYKI's Arabic blog---see blog list at sidebar), @BBCArabicNews, @AJArabic (Al Jazeera), @arabic_poems, @arabic_quotes, @Al_Arabiya_Ar
Here's another example of how Twitter can be helpful. This account isn't all-Arabic, but this little blog link was interesting, & good practice for my Arabic reading.
@globalvoices: MJ Death Reaction in Kuwait: a mixture... http://tinyurl.com/m9m4chSorry this isn't much of a post. I know I haven't kept my promise to this blog. But I'm not giving up on it!