I would like to know the correct way to connect PPTP/IPSEC over my 
wireless AP which is running on M0n0wall.

I have a net4521:
LAN 192.168.1.1/24
WAN External IP
OPT1 10.10.10.1/8 (Wireless)

Right now I seem to be connected over PPTP as outlined in the doc 
[http://m0n0.ch/wall/docbook/pptp.html].  I am connected on the wireless 
network in the m0n0wall box on the 10.10.10.x subnet, and I configured 
PPTP's server address to be: 10.10.10.254.  This seems to work but I 
want to be sure this is the right way to do things and that everything 
is now encrypted properly.

My ipconfig shows the following: [does all traffic now run encrpyed thru 
the PPTP session now?]
Ethernet adapter Wireless Network Connection 6:
         Connection-specific DNS Suffix  . : local
         IP Address. . . . . . . . . . . . : 10.10.10.199
         Subnet Mask . . . . . . . . . . . : 255.0.0.0
         Default Gateway . . . . . . . . . : 10.10.10.1

Ethernet adapter Local Area Connection:
         Media State . . . . . . . . . . . : Media disconnected

PPP adapter HomeNetwork:
         Connection-specific DNS Suffix  . :
         IP Address. . . . . . . . . . . . : 10.10.10.208
         Subnet Mask . . . . . . . . . . . : 255.255.255.255
         Default Gateway . . . . . . . . . : 10.10.10.208

My client is a XP SP2 box using XP's PPTP.

I haven't been able to immediately find a 'free' IPSEC Client, am I 
missing something or does one exist?

Also would like to get this working with a linux client, the info is 
pretty sketchy in regard to specific m0n0 docs for this, does anyone 
have a pointer/howto for connecting using sing PPTP or IPSEC from linux 
client.

L