I frequently connect to Windows hosts from my Mac and I have been using the Microsoft Remote Desktop Connection client for Mac OS X. The trouble with this is that it only allows a single connection and it’s not a universal binary (it also has a tendency to crash on exit, requiring a forced quit). I use rdesktop on my Linux boxes, and figured it ought to be available for the Mac (it is, using fink, or by compiling from source) but I also came across CoRD (via Lifehacker) and TSclientX (via the comments on the Lifehacker post) – both of which seem to offer a much richer user experience:

• CoRD allows multiple RDP connections as well as storing login credentials. It seems pretty responsive too.
• TSclientX s essentially a GUI wrapper for rdesktop and therefore requires X11. That shouldn’t really be a problem but it does sometimes feel like a bit of a kludge – even so, it has the potential to be extremely useful as it supports SeamlessRDP. Unfortunately, SeamlessRDP requires additional software to be present on the remote Windows system and I couldn’t get it to work for me, possibly because I was connecting to a Windows XP machine (which only supports a single connection) and rdesktop creates a X11 window for each window on the server side.

At the moment, I’ve settled on CoRD, largely due to its ease of use but both clients seem to offer a great improvement over Microsoft’s RDP offering for Mac users.