Here are the latest Indie and XBLA Xbox Live activity charts for April 12th to 19th courtesy of Major Nelson.

Top Indie Games (Full Versions purchased)
1    I MAED A GAM3 W1TH Z0MB1ES!!!1
2    Yet Another Zombie Defense
3    Baby Maker Extreme
4    Avatar Showdown
5    The Impossible Game
6    The Impossible Avatar Getaway
7    Super Avatar
8    Let’s Learn Japanese: Beginner
9    Avatar Drop
10  Miner Dig Deep
11  Avatar Bumper Cars
12  Avatar Street Basketball
13  Home Run Challenge
14  Avatars, Ghosts’n Zombies
15  Inside Lacrosse’s CL2010
16  Shoot 1UP
17  Head Shot 2
18  Avatar Golf
19  Avatar QuizCall
20  Massage Me

Top Arcade Titles (Full Versions purchased)
1 Final Fight: Double Impact
2 Game Room **
3 Toy Soldiers
4 Perfect Dark
5 Trials HD
6 Castle Crashers
7 Battlefield 1943
8 UNO
9 MEGA MAN 10
10 Geometry Wars: Retro Evolved 2
11 Magic: The Gathering
12 Worms 2: Armageddon
13 Marvel vs. Capcom 2
14 Hasbro Family Game Night *
15 Worms
16 Marble Blast Ultra
17 Shadow Complex
18 Peggle
19 SOUTH PARK LET’S GO TOWER DEFENSE PLAY!
20 Castlevania: Symphony of the Night

Thanks to Major Nelsons blog for the news.