Mina-san, konnichiwa! Kore wa katakana no mono:

Manga:
Melty Blood manga page
Suzumiya Haruhi no Yuutsu manga page
These two pages show how katakana is used for sound effects.

Magazine scans:
NewType - February 2009 page 125
NewType - April 2009 cover page
NewType - August 2009 page 198
NewType - October 2009 page 131
Random scan
Most of the katakana usage in these pages are for names or foreign phrases.

Advertisement and products:
"Nanami Chips"
E-mobile phone ad
Katakana is used for the names of products.

Subway maps:
Kounai station
Kobe station
Hakata station
Rittai station
Osaka Station
Osaka Station 3D
Kyoto Station
Source website
Katakana is used for English sounding place names like taxi or elevator.

Anime:
Azumanga Daioh clip
Another Azumanga Daioh clip
Katakana is used for foreign phrases.

Music:
Motto Hade Ni Ne! by Haruka Tomatsu
Motto Hade Ni Ne! Lyrics
Kannagi Openning video
Katakana is used for foreign phrases.