This is really useful resource for conjugating verbs.
http://www.verbix.com/languages/welsh.shtml
This is my favourite online dictionary:
Hope these help 
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Thanks!
For what it’s worth, the online dictionaries I’ve been using so far are:
- http://www.geiriadur.net/
- http://geiriadur.bangor.ac.uk/
- http://www.gweiadur.com/en/Pawb (free registration required)
- Geiriadur Prifysgol Cymru
They all seem to have their pros and cons.
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