I'll be staying in Toronto May 2005 and then a couple of nights in Niagara - Any ideas on the best ways to get between the 2 ?

Hiya,
I did the journey by train - look at viarail.com
Journey takes about 2 hours. Canadian trains are pretty good too - very reliable and not expensive.

If you're gonna be travelling the whole Eastern side of Canada - Montreal, Quebec etc there's a rail card for about £100 for 10 days.... saves you quite a lot.

Agreed, the train is an easy way to get between the two. The train station is easy to get to in Toronto but the staion at Niagara is about a 45 minute walk to the falls so better to get a taxi.