Three days ago I sent the following tweet, it is in spanish but I think that everybody will understand what it is about:
Yes, my MSX sent a tweet and it was not connected to Internet by any wire, but via Wifi. :)
And how is this possible? By using a Denyonet and a little toy named TP-LINK TL-WA500G. It is a wireless access point which is quite affordable (about 25€) and among other things has a nice thing named client mode:
Client Mode: connects an AP TL-WA500G to your game consoles, setop box or other multimedia devices that with Ethernet port, and join them into your current wireless network, easily making them WiFi enabled while eliminating the need of running unsightly cables and installing drivers
And for the fist time in my life, I didn't mind my MSX to be considered as a "game console" ;)
I tell this here just in case someone was willing to put his MSX online but was not able to use a wired network. Well, this is the proof that it is possible, and now you know how.
By the way, thanks to this gadget I have been able to move my MSX setup from my kids bedroom (where the cable modem is placed) to my own bedroom, and this is how the whole thing looks like now (never mind the diapers bag in the corner):
Except for the TL-WA500G, it could pass as a photo took in the 80s, isn't it? :P
I'm waiting for my own Denyonet, so i can tweet with my own NMS8245 
looks nice. 
