bah! L~R beat me to it again..

in the spirit of TIMTOWTDI...

..note I've swapped '\t' for ',' to make it easily copy/pasted..

#!/usr/bin/perl

my %hash;
while(<DATA>){
  chomp;
  my @line = split /,/;
  my $first = shift @line;
  push( @{$hash{$first}}, @line );
}

foreach( sort keys %hash ){
  print "$_\t".join(' ', sort @{$hash{$_}})."\n";
}

__DATA__
text1,text-a,text-w
text2,text-b,text-y
text3,text-x,text-t
text1,text-d,text-n
text3,text-f,text-z
text3,text-e,text-w
text10,word,other 1
text10,aword,nother 1
text11,cword,tother 1
text11,zword,bother 1

__END__

prints:
text1   text-a text-d text-n text-w
text10  aword nother 1 other 1 word
text11  bother 1 cword tother 1 zword
text2   text-b text-y
text3   text-e text-f text-t text-w text-x text-z
[download]

Update: hmm.. this version doesn't produce the lines in the order it found them (it sorts but the first word in the line), but that's easily changed if required as per the other examples..

cheers,

J