Code Golf - Banner Generation

Answer 1

F#, 382 chars

I compressed two letters from each row into an ascii-printable byte, and handled space and exclamation point specially.

let s,(!)=stdin.ReadLine(),printf"%s"
for n in 0..4 do
 for c in s do if c=' '||n=3&&c='!'then !"    "elif c='!'then !"!!! "else for x in 0..3 do printf"%c"(if(Array.collect(fun b->let B n=int b&&&n=0 in[|(B 64)||not(B 8);B 32;B 16;true;B 4;B 2;B 1;true|])"wvwuwTUwvwUUWUEDEiTwUUBURQwEfWidWWVrUrrUEDUmTUTuZUr\\WvtuwWUturruw"B).[n*104+(int c-int 'A')*4+x]then ' 'else c)
 !"\n"

Sample I/O below:

HELLO WORLD!!!
H H EEE L   L   OOO     W W OOO RR  L   DD  !!! !!! !!!
H H E   L   L   O O     W W O O R R L   D D !!! !!! !!!
HHH EE  L   L   O O     WWW O O RR  L   D D !!! !!! !!!
H H E   L   L   O O     WWW O O R R L   D D
H H EEE LLL LLL OOO     WWW OOO R R LLL DD  !!! !!! !!!

ABCDEFGHIJKL
AAA BBB CCC DD  EEE FFF GGG H H III JJJ K K L
A A B B C   D D E   F   G   H H  I    J K K L
AAA BBB C   D D EE  FF  G G HHH  I    J KK  L
A A B B C   D D E   F   G G H H  I  J J K K L
A A BBB CCC DD  EEE F   GGG H H III JJJ K K LLL

MNOPQRSTUVWXYZ
M M N N OOO PPP QQQ RR  SSS TTT U U V V W W X X Y Y ZZZ
MMM NNN O O P P Q Q R R S    T  U U V V W W  X  Y Y   Z
M M NNN O O PPP Q Q RR  SSS  T  U U V V WWW  X  YYY  Z
M M N N O O P   QQQ R R   S  T  U U V V WWW  X    Y Z
M M N N OOO P   QQQ R R SSS  T  UUU  V  WWW X X YYY ZZZ

Answer 2

Python: 259 chars

Not the shortest, but considering it was my first Python script, I'm more than satisfied.

k=raw_input()
for i in range(5):print' '.join(''.join((' ',x)[int(z)]for z in bin(int(''.join('%02d'%(ord(q)-43)for q in'xwxvxabxwxbbdqbXWX@axbbUb_^qxXwd@kddcsbssqbXWvDabav7bs9+dwuvxdbuvssvxq')[i*28+'ABCDEFGHIJKLMNOPQRSTUVWXYZ! '.find(x)],8))[2:])for x in k)