diff --git a/runtime/syntax/sml.vim b/runtime/syntax/sml.vim
index a45b204..aa7d64a 100644
--- a/runtime/syntax/sml.vim
+++ b/runtime/syntax/sml.vim
@@ -4,9 +4,9 @@
 " Maintainers:  Markus Mottl            <markus.mottl@gmail.com>
 "               Fabrizio Zeno Cornelli  <zeno@filibusta.crema.unimi.it>
 " URL:          http://www.ocaml.info/vim/syntax/sml.vim
-" Last Change:  2006 Feb 05
+" Last Change:  2006 Oct 23 - Fixed character highlighting bug (MM)
+"               2002 Jun 02 - Fixed small typo  (MM)
 "               2001 Nov 20 - Fixed small highlighting bug with modules (MM)
-"               2001 Aug 29 - Fixed small highlighting bug  (MM)
 
 " For version 5.x: Clear all syntax items
 " For version 6.x: Quit when a syntax file was already loaded
@@ -137,7 +137,7 @@
 " Module prefix
 syn match    smlModPath      "\u\(\w\|'\)*\."he=e-1
 
-syn match    smlCharacter    +#"."\|#"\\\d\d\d"+
+syn match    smlCharacter    +#"\\""\|#"."\|#"\\\d\d\d"+
 syn match    smlCharErr      +#"\\\d\d"\|#"\\\d"+
 syn region   smlString       start=+"+ skip=+\\\\\|\\"+ end=+"+
 
diff --git a/runtime/syntax/verilog.vim b/runtime/syntax/verilog.vim
index aad918c..01f312f 100644
--- a/runtime/syntax/verilog.vim
+++ b/runtime/syntax/verilog.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language:	Verilog
-" Maintainer:	Mun Johl <mun_johl@sierralogic.com>
-" Last Update:  Tue Jun  7 14:27:10 PDT 2005
+" Maintainer:	Mun Johl <Mun.Johl@emulex.com>
+" Last Update:  Fri Oct 13 11:44:32 PDT 2006
 
 " For version 5.x: Clear all syntax items
 " For version 6.x: Quit when a syntax file was already loaded
@@ -76,10 +76,10 @@
 
 syn match   verilogConstant "\<[A-Z][A-Z0-9_]\+\>"
 
-syn match   verilogNumber "\(\<\d\+\|\)'[bB]\s*[0-1_xXzZ?]\+\>"
-syn match   verilogNumber "\(\<\d\+\|\)'[oO]\s*[0-7_xXzZ?]\+\>"
-syn match   verilogNumber "\(\<\d\+\|\)'[dD]\s*[0-9_xXzZ?]\+\>"
-syn match   verilogNumber "\(\<\d\+\|\)'[hH]\s*[0-9a-fA-F_xXzZ?]\+\>"
+syn match   verilogNumber "\(\<\d\+\|\)'[sS]\?[bB]\s*[0-1_xXzZ?]\+\>"
+syn match   verilogNumber "\(\<\d\+\|\)'[sS]\?[oO]\s*[0-7_xXzZ?]\+\>"
+syn match   verilogNumber "\(\<\d\+\|\)'[sS]\?[dD]\s*[0-9_xXzZ?]\+\>"
+syn match   verilogNumber "\(\<\d\+\|\)'[sS]\?[hH]\s*[0-9a-fA-F_xXzZ?]\+\>"
 syn match   verilogNumber "\<[+-]\=[0-9_]\+\(\.[0-9_]*\|\)\(e[0-9_]*\|\)\>"
 
 syn region  verilogString start=+"+ skip=+\\"+ end=+"+ contains=verilogEscape,@Spell
diff --git a/runtime/syntax/xmath.vim b/runtime/syntax/xmath.vim
index e9c3762..83efb08 100644
--- a/runtime/syntax/xmath.vim
+++ b/runtime/syntax/xmath.vim
@@ -1,8 +1,8 @@
 " Vim syntax file
 " Language:	xmath (a simulation tool)
 " Maintainer:	Dr. Charles E. Campbell, Jr. <NdrOchipS@PcampbellAfamily.Mbiz>
-" Last Change:	Apr 12, 2006
-" Version:	5
+" Last Change:	Sep 11, 2006
+" Version:	6
 " URL:	http://mysite.verizon.net/astronaut/vim/index.html#vimlinks_syntax
 
 " For version 5.x: Clear all syntax items
@@ -175,7 +175,7 @@
 " String and Character constants
 " Highlight special characters (those which have a backslash) differently
 syn match   xmathSpecial	contained "\\\d\d\d\|\\."
-syn region  xmathString	start=+"+  skip=+\\\\\|\\"+  end=+"+ contains=xmathSpecial
+syn region  xmathString	start=+"+  skip=+\\\\\|\\"+  end=+"+ contains=xmathSpecial,@Spell
 syn match   xmathCharacter	"'[^\\]'"
 syn match   xmathSpecialChar	"'\\.'"
 
@@ -184,9 +184,10 @@
 " Comments:
 " xmath supports #...  (like Unix shells)
 "       and      #{ ... }# comment blocks
+syn cluster xmathCommentGroup	contains=xmathString,xmathTodo,@Spell
 syn keyword xmathTodo contained	COMBAK	DEBUG	FIXME	Todo	TODO	XXX
-syn match   xmathComment	"#.*$"		contains=xmathString,xmathTodo,@Spell
-syn region  xmathCommentBlock	start="#{" end="}#"	contains=xmathString,xmathTodo
+syn match   xmathComment	"#.*$"		contains=@xmathCommentGroup
+syn region  xmathCommentBlock	start="#{" end="}#"	contains=@xmathCommentGroup
 
 " synchronizing
 syn sync match xmathSyncComment	grouphere xmathCommentBlock "#{"