How long have you been on Hacker News? Your account is only 20 days old; can you pass adequate judgment on the matter?
Simple answer: Apple is popular in Hacker News lately because they've done a lot of interesting (~ discussion-worthy) things lately, such as: change the App Store guidelines to demand 30% of subscriptions revenue, released a Mac OS X Lion developer preview, the iPad 2, renewed their Mac Book Pro lineup, Thunderbolt, controversy between Amazon and Apple regarding the name App Store...