TLer can also learn wall-in tips through the LiquidPedia wiki links below, enjoy :-)
1st 2005-2006
??
2nd 2006-2007
http://wiki.teamliquid.net/starcraft/Peaks_of_Baekdu
http://www.teamliquid.net/tlpd/korean/maps/6_Sin_Peaks_of_Baekdu
3rd 2007-2008
http://wiki.teamliquid.net/starcraft/Blue_Storm
http://www.teamliquid.net/tlpd/korean/maps/159_Blue_Storm
4th 2008-2009
http://wiki.teamliquid.net/starcraft/Destination
http://www.teamliquid.net/tlpd/korean/maps/188_Destination
5th 2010
http://wiki.teamliquid.net/starcraft/Fighting_Spirit
http://www.teamliquid.net/tlpd/korean/maps/237_Fighting_Spirit
6th 2011
http://wiki.teamliquid.net/starcraft/Circuit_Breaker
http://www.teamliquid.net/tlpd/korean/maps/404_Circuit_Breaker
7th 2012
??
Ref:
http://www.teamliquid.net/tlpd/korean/maps
http://walls.tips
http://wiki.teamliquid.net/starcraft/Tau_Cross
http://wiki.teamliquid.net/starcraft/Longinus
http://wiki.teamliquid.net/starcraft/Match_Point
http://wiki.teamliquid.net/starcraft/Jade