In the UK: Britpop 2.0 - arrogant young men wearing skinny jeans, hanging out in Camden and making 'angular' indie pop with self-consciously mundane subject matter. Also the whole Amy Winehouse/Pete Doherty/Agynes Deyn tabloid gossip axis.
In the US: all that baroque indie folk stuff.
Horrible tuneless 'dance punk', and it's UK equivalent 'Nu-Rave'.
Elaborate DVD trilogy box sets with multiple commentary tracks and hours of extra features.
Mainstream films making hamfisted allegories of Iraq and the war on terror.
Blockbuster sequels being filmed back-to-back with unfinished scripts.